Resource RBY and GSC Illegal Movesets

Wild Eep

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Wigglytuff - Dizzy Punch + Petal Dance (illegal)

Oddish/Gloom/Vileplume/Bellossom - Swords Dance + Leech Seed (legal)
You can teach Swords Dance to Oddish in RBY.

Paras/Parasect - Counter + Screech (legal)
Gligar can learn both at the same time and pass to Paras. Gligar can't learn Pursuit though, so Counter + Screech + Pursuit is illegal.

Venomoth
Baton Pass + Flash (legal)
Venonat can't learn Flash with HM05 in GSC, but Venomoth can.
Diglett/Dugrio - Bubblebeam (illegal)

Primeape - Rage + Beat Up/Foresight/Reversal (legal)
Illegal for Mankey, but Primeape can learn Rage through level up.

Arcanine - Flame Wheel + Teleport (legal)
Flame Wheel is considered a basic move for Arcanine, so it can be learn through the Move Reminder.

Poliwag/Poliwhirl/Poliwrath/Politoed - Growth + Haze/Mist/Splash/Lovely Kiss/Sweet Kiss (illegal)

Poliwag/Poliwhirl/Politoed - Growth + Mind Reader (illegal)
Not for Poliwrath, as it can learn Mind Reader through level up.

Poliwrath - Sweet Kiss + Submission (legal)
Poliwrath can also learn Submission through level up.

Tentacool/Tentacruel - Confuse Ray + Aurora Beam/Haze/Mirror Coat/Rapid Spin/Safeguard (illegal)
Verified and fixed all of these. Thank you for going through this!

These changes also impacted the RBY Tradebacks list in post #1 for Jigglypuff/Wigglytuff, Oddish/Gloom/Vileplume, Paras/Parasect, Poliwag/Poliwhirl/Poliwrath, and Tentacool/Tentacruel.
 

gumnas

formerly .Maguss.
Geodude/Graveler/Golem - Rapid Spin + Mega Punch
This combination is listed twice.

Slowpoke/Slowbro/Slowking - Future Sight + Safeguard (legal)
Lapras can learn both at the same time and pass to Slowpoke.

Slowbro - Future Sight + Seismic Toss (illegal)

Doduo/Dodrio - Rage + Faint Attack/Flail (legal)
Can learn Rage through level up.

Seel/Dewgong - Take Down + Encore/Perish Song/Flail (legal)
Can learn Take Down through level up.

Seel/Dewgong - Strength + Encore/Perish Song/Flail (illegal)
This is a weird one. For some reason, Seel and Dewgong can only learn the HM04 move in RBY.

Gengar - Perish Song + Mega Kick/Mega Punch/Take Down (illegal)

Onix/Steelix - Flail + Take Down (illegal)

Exeggcute/Exeggutor - Synthesis + Sweet Scent (illegal)

Cubone/Marowak - Screech + Swords Dance (legal)
Lickitung can learn both and pass to Cubone.

Hitmonchan - Dizzy Punch + Hi Jump Kick (illegal)

Rhyhorn - Mega Drain (illegal)

Rhydon - Counter + Crunch/Magnitude/Pursuit/Reversal (legal)
All egg moves. Smeargle can pass them all.

Chansey/Blissey - Pay Day (illegal)

Chansey/Blissey - Sweet Scent + Heal Bell/Present/the RBY moves (illegal)
 

Wild Eep

pet pet pet
is a Forum Moderatoris a Senior Staff Member Alumnusis a Researcher Alumnus
Geodude/Graveler/Golem - Rapid Spin + Mega Punch
This combination is listed twice.

Slowpoke/Slowbro/Slowking - Future Sight + Safeguard (legal)
Lapras can learn both at the same time and pass to Slowpoke.

Slowbro - Future Sight + Seismic Toss (illegal)

Doduo/Dodrio - Rage + Faint Attack/Flail (legal)
Can learn Rage through level up.

Seel/Dewgong - Take Down + Encore/Perish Song/Flail (legal)
Can learn Take Down through level up.

Seel/Dewgong - Strength + Encore/Perish Song/Flail (illegal)
This is a weird one. For some reason, Seel and Dewgong can only learn the HM04 move in RBY.

Gengar - Perish Song + Mega Kick/Mega Punch/Take Down (illegal)

Onix/Steelix - Flail + Take Down (illegal)

Exeggcute/Exeggutor - Synthesis + Sweet Scent (illegal)

Cubone/Marowak - Screech + Swords Dance (legal)
Lickitung can learn both and pass to Cubone.

Hitmonchan - Dizzy Punch + Hi Jump Kick (illegal)

Rhyhorn - Mega Drain (illegal)

Rhydon - Counter + Crunch/Magnitude/Pursuit/Reversal (legal)
All egg moves. Smeargle can pass them all.

Chansey/Blissey - Pay Day (illegal)

Chansey/Blissey - Sweet Scent + Heal Bell/Present/the RBY moves (illegal)
All fixed again! I think I must have mistakenly thought there might have been an event Chansey with Pay Day, but I was mistaken! Event moves were very poorly documented back in the day.
 

gumnas

formerly .Maguss.
Jynx - Selfdestruct/Egg Bomb (illegal)
Jynx - Sweet Kiss + Thrash (illegal)

Elekid/Electabuzz - Dizzy Punch + [g]Male (legal)
Dizzy Punch was also a NYPC move.

Magby - Dizzy Punch + Mega Punch (illegal)
Magby - Karate Chop + Mega Punch + Screech (illegal)
Those two are legal for Magmar, as it can learn Mega Punch in RBY, but not for Magby.

Pinsir - Sweet Kiss (PROBABLY illegal)
This is a hard one to confirm. Pokémon's official website at the time listed Pinsir with Sweet Kiss, but even players at the time said it was a mistake. It was supposed to be Snorlax. No other major source lists it, including Bulbapedia, so I guess it is indeed illegal.

Vaporeon - Charm/Flail + Bubblebeam (illegal)
Vaporeon - Charm/Flail + Mist (illegal)

Kabuto - Slash + Flail/Rapid Spin (illegal)
Kabuto - Surf + Flail/Rapid Spin (illegal)
Those are legal for Kabutops, but Kabuto can only learn Slash and Surf in RBY.

Snorlax - Teleport (illegal)
 

gumnas

formerly .Maguss.
Chikorita/Bayleef/Meganium - Flail + Vine Whip (legal)
Tangela can pass both.

Marill/Azumarill
With 8 egg moves, and no Smeargle at the Egg Group, this is definitely the most complex so far. Almost lose my mind trying to check all possible combinations.

- Amnesia + Perish Song (legal)
Politoed can pass both. Politoed can't learn Future Sight, so Amnesia + Perish Song + Future Sight is illegal.

- Belly Drum + Perish Song (legal)
Politoed again.

- Future Sight + Light Screen (legal)
Psyduck/Golduck can pass both. Future Sight + Light Screen + Amnesia/Present is illegal though.

- Amnesia + Dizzy Punch/Hydro Pump/Scary Face (illegal)

- Supersonic + Dizzy Punch/Hydro Pump/Scary Face (illegal)
 

Wild Eep

pet pet pet
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Chikorita/Bayleef/Meganium - Flail + Vine Whip (legal)
Tangela can pass both.

Marill/Azumarill
With 8 egg moves, and no Smeargle at the Egg Group, this is definitely the most complex so far. Almost lose my mind trying to check all possible combinations.

- Amnesia + Perish Song (legal)
Politoed can pass both. Politoed can't learn Future Sight, so Amnesia + Perish Song + Future Sight is illegal.

- Belly Drum + Perish Song (legal)
Politoed again.

- Future Sight + Light Screen (legal)
Psyduck/Golduck can pass both. Future Sight + Light Screen + Amnesia/Present is illegal though.

- Amnesia + Dizzy Punch/Hydro Pump/Scary Face (illegal)

- Supersonic + Dizzy Punch/Hydro Pump/Scary Face (illegal)
Fixed this and the other post above it!
 

gumnas

formerly .Maguss.
Murkrow
- Drill Peck + Wing Attack (illegal)
- Beat Up + Drill Peck/Mirror Move/Quick Attack/Sky Attack/Whirlwind/Wing Attack (illegal)
Murkrow isn't listed at all.

Corsola - Amnesia + Screech (legal)
Psyduck/Golduck can pass both.

Mantine - Haze + Hydro Pump + Twister (legal)
Horsea/Seadra/Kingdra can learn all three at the same time and pass to Mantine. Haze + Hydro Pump + Twister + Slam is illegal though.

Not sure if it is relevant, but I also found combinations that are only illegal if NYPC moves are banned:
Bulbasaur/Ivysaur/Venusaur - Petal Dance + Light Screen/Safeguard
Squirtle/Wartortle/Blastoise - Flail + Haze
Bellsprout/Weepinbell/Victreebel - Leech Life + Synthesis
Doduo/Dodrio - Flail + Haze/Supersonic
Horsea/Seadra/Kingdra - Aurora Beam + Flail
Kabuto/Kabutops - Aurora Beam + Flail
Chikorita/Bayleef/Meganium - AncientPower + Vine Whip
Spinarak/Ariados - Pursuit + SonicBoom
Marill/Azumarill - Future Sight + Perish Song
Mantine - Hydro Pump + Twister + Haze/Slam

Also, since you add Charm to Snorlax, and the Bulbasaur and Oddish family in your list, you may add Aurora Beam, Barrier and Supersonic to Staryu/Starmie. It is the same case. But that's up to you, of course.

And that's it. I hope everything is correct now.
 

Wild Eep

pet pet pet
is a Forum Moderatoris a Senior Staff Member Alumnusis a Researcher Alumnus
Murkrow
- Drill Peck + Wing Attack (illegal)
- Beat Up + Drill Peck/Mirror Move/Quick Attack/Sky Attack/Whirlwind/Wing Attack (illegal)
Murkrow isn't listed at all.

Corsola - Amnesia + Screech (legal)
Psyduck/Golduck can pass both.

Mantine - Haze + Hydro Pump + Twister (legal)
Horsea/Seadra/Kingdra can learn all three at the same time and pass to Mantine. Haze + Hydro Pump + Twister + Slam is illegal though.

Not sure if it is relevant, but I also found combinations that are only illegal if NYPC moves are banned:
Bulbasaur/Ivysaur/Venusaur - Petal Dance + Light Screen/Safeguard
Squirtle/Wartortle/Blastoise - Flail + Haze
Bellsprout/Weepinbell/Victreebel - Leech Life + Synthesis
Doduo/Dodrio - Flail + Haze/Supersonic
Horsea/Seadra/Kingdra - Aurora Beam + Flail
Kabuto/Kabutops - Aurora Beam + Flail
Chikorita/Bayleef/Meganium - AncientPower + Vine Whip
Spinarak/Ariados - Pursuit + SonicBoom
Marill/Azumarill - Future Sight + Perish Song
Mantine - Hydro Pump + Twister + Haze/Slam

Also, since you add Charm to Snorlax, and the Bulbasaur and Oddish family in your list, you may add Aurora Beam, Barrier and Supersonic to Staryu/Starmie. It is the same case. But that's up to you, of course.

And that's it. I hope everything is correct now.
Fixed all the errors.

For Corsola, I think the revelation that Amnesia + Screech is legal leads to the need to add Amnesia + Safeguard + Screech to the list (Amnesia + Safeguard from Slowpoke/others, Amnesia + Screech from Psyduck, and Screech + Safeguard from Tentacool, but none that I see provide all three at once).

The no-NYPC list is handy for a Virtual Console legality list, which I might want to work on in the future since this impacts move legality downstream in generations 7 and 8. A Virtual Console list would have no access to Stadium games (read: no move relearner) or any events.

Thank you once again for going through this with a fine-toothed comb and catching my typos and more major misses!
 
RBYGSC Illegal Movesets as relevant to the Virtual Console release and Gen 7

I went ahead and adjusted / trimmed / expanded the illegalities listed in this thread by Wild Eep as relevant to the virtual console releases of Gen 1 and Gen 2, since those are the releases we’ll be dealing with for Gen 7 and onward. This is maybe better suited for a post in the Gen 7 forum, since it’s not really relevant for actual competitive play in Gen 2. That said, it’s so deeply routed in Gen 2 and this thread in particular, it felt better placed here as supplementary material rather than as an orphan in the Gen 7 section. And hey, the thread's already a multi-gen affair starting with RBY illegalities as is so what’s one more gen getting involved?

Method

What I’ve done here taken WildEep’s learnset information and made it relevant for Gen 7 transfer legality.

First is removing the differences in moveset legality in Gen 2 proper vs Gen 2 VC. To do that I have:
  • Deleted any moves that required Pokemon Stadium 1 or 2 (Baton Pass Farfetch’d)
  • Deleted all illegal combos involving event-only attacks. (Everything NYPC)
  • Scanned for any new illegal combos the absence of events might cause (Sweet Kiss + Metronome Jynx)
  • Scanned for any new illegalities that lacking the PS2 move relearner might cause (Horn Attack Piloswine)
Then, I adjusted the illegal move combos to account for the Pokemon’s legality in Gen 7. To do this I have:
  • Deleted any moves Pokemon Transporter just does not allow through (Dizzy Punch Mystery Eggs)
  • Deleted any combos that involved an accessible TM, Move Tutor, or relearnable move in Gen 7
  • Scanned Pokemon movepools for any potential issues with pre evolution exclusive Gen 7 attacks and VC evolution exclusive moves. (Listed separately in this post outside the pastebin)
It’s important to note: This is an assessment of illegal egg move problems with VC imported Pokemon. It is NOT an indication that the Pokemon cannot have the move set at all in Gen 7. Things like Ancient Power + Pursuit Larvitar are only illegal in Gen 2 because of egg move problems. It’s perfectly legal on a Tyranitar in Gen 7.

However, they’re still relevant to know because using one of these move combos + any other VC exclusive option (IE, exclusive attack or attacks only possible with a Hidden Ability through VC) will make an illegal move set. If you want Ancient Power + Pursuit + DynanichPunch Tyranitar (for some reason), you’ll have to get it with Sand Stream because that egg move illegality makes it impossible with Unnerve.


Illegal Move Combos for VC Pokemon Transferred to Gen 7

https://pastebin.com/PuX4ZRYQ
(way too huge for a single post)

Again, this list takes into account if they're legal after transfer to Gen 7. This is not in the actual VC release itself. Consider this how legal the Pokemon are the moment they've moved to Pokemon Bank.

Complications with Gen 7 Pre Evo Only Attacks + VC Evolution Only Attacks

I put some extra focus into finding any problems with Gen 7 pre evolved level up moves + VC evo exclusive moves since it seemed that would be an element that might require hard coding by someone. Pokemon Showdown’s legality checker has issues verifying that sort of thing easily, and has led to things like Sucker Punch + Leaf Blade Shiftry in Gen 6 & 7 being a hard coded illegality in the past.

If a gen 2 evolution doesn’t gain any extra moves upon its evolution in gen 2, there are no legality problems with pre evo move + evolution only gen 1-2 move. You can simply import the unevolved pokemon from gen 2, have it learn whatever moves you’d like, and then let it evolve. Problems arise when that evolution has an attack it can only learn as an evolution. Slowpoke learns Slack Off by level up in Gen 7, but Slowking doesn’t. However, Slowking learns DynamicPunch in Gen 2 while Slowpoke doesn’t. This means that DynamicPunch + Slack Off is illegal on Regenerator Slowking in Gen 7.

I have manually scanned every gen 1+2 movepool of the below Pokemon to see if they gained any new attacks as their pre evolution in Gen 7. Any attacks that can also be taught in Gen 7 by TM, Move Tutor, final evolution relearner, have been neglected. The actual moves themselves aren’t detailed unless both are set to yes; there otherwise isn’t a move set legality problem.

Chansey, Mr. Mime, Snorlax, Sudowoodo, and Marill all gain baby evolutions with exclusive attacks. Any moveset pulling a unique level up or egg move from the Gen 3-4 baby Pokemon is obviously illegal. Pokemon Showdown catches this currently, so I didn’t pay it much attention. Obviously anything with these 5 is fully incompatible with VC exclusive things.

Again, some of these move sets are legal from other approaches; Hitmontop with Dig + Fake Out + Hidden Ability for example. However each of these Pokemon have at least some VC exclusive attacks that can’t be imported from prior generations. Curse is a perfect example, only being distributed this freely in Gen 2. Endure is a less exciting move like this.

VC Exclusive Attack + Pre Evo Gen 7 Attack Illegalities

Unique Gen 1-2 Evolution only moves and Unique Gen 7 Pre Evo moves are ILLEGAL

Code:
Pikachu
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Defense Curl, Strength, Mega Punch, Mega Kick, Body Slam, Take Down, Double-Edge, Pay Day, Submission, Seismic Toss, Rage, Mimic, Reflect, Bide, Skull Bash
Unique Gen 7 Pre Evo Moves? - YES, Nasty Plot, Uproar

Nidoqueen
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Fury Cutter, Mega Punch, Mega Kick, Horn Drill, Pay Day, Submission, Seismic Toss, Fissure
Unique Gen 7 Pre Evo Moves? - YES, Toxic Spikes, Flatter, Crunch, Captivate, Poison Fang

Nidoking
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Fury Cutter, Mega Punch, Mega Kick, Horn Drill, Pay Day, Submission, Seismic Toss, Fissure
Unique Gen 7 Pre Evo Moves? - YES, Toxic Spikes, Flatter, Captivate

Clefairy
Unique Gen 1-2 Evolution Moves? - Yes, DynamicPunch, Strength, Mega Punch, Mega Kick, Take Down, Double-Edge, BubbleBeam, Water Gun, Submission, Counter, Seismic Toss, Rage, Teleport, Mimic, Bide, Skull Bash, Psywave, Tri Attack
Unique Gen 7 Pre Evo Moves? - YES, Uproar, Magical Leaf, Copycat

Jigglypuff
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Strength, Mega Punch, Mega Kick, Take Down, BubbleBeam, Water Gun, Submission, Counter, Seismic Toss, Rage, Teleport, Mimic, Bide, Skull Bash, Psywave, Tri Attack
Unique Gen 7 Pre Evo Moves? - YES, Copycat, Uproar

Vileplume
Unique Evolution Moves? - YES, Body Slam
Unique Pre Evo Moves? - YES, Growth, Lucky Chant, Natural Gift, Grassy Terrain, Moonblast

Arcanine
Unique Gen 1-2 Evolution Moves? - YES, Teleport
Unique Gen 7 Pre Evo Moves? - YES, Reversal, Flame Burst, Retaliate, Crunch*, Flare Blitz
*Note: There is more to this move’s legality. See the next section.

Victreebel
Unique Evolution Moves? - YES, Body Slam
Unique Pre Evo Moves? - YES, Wring Out

Exeggutor
Unique Gen 1-2 Evolution Moves? - YES, Headbutt, Mega Drain
Unique Gen 7 Pre Evo Moves? - YES, Bullet Seed, Natural Gift, Extrasensory, Bestow, Uproar

Hitmonchan
Unique Evolution Moves? - YES, DynamicPunch, Mega Kick, Body Slam, Take Down, Double Edge, Submission, Seismic Toss, Rage, Mimic, Bide, Metronome, Skull Bash
Unique Pre Evo Moves? - YES, Fake Out, Foresight, Uproar

Hitmonlee
Unique Evolution Moves? - YES, DynamicPunch, Mega Punch, Body Slam, Take Down, Double Edge, Submission, Seismic Toss, Rage, Mimic, Bide, Metronome, Skull Bash
Unique Pre Evo Moves? - YES, Fake Out, Foresight, Uproar

Jynx
Unique Gen 1-2 Evolution Moves? - YES, Headbutt, Thrash, Mega Punch, Mega Kick, Take Down, Double-Edge, Bubblebeam, Water Gun, Submission, Counter, Seismic Toss, Rage, Teleport, Mimic, Bide, Metronome, Skull Bash, Psywave, Substitute
Unique Gen 7 Pre Evo Moves? - YES, Lucky Chant, Copycat, Uproar

Electabuzz
Unique Gen 1-2 Evolution Moves? - YES, Rock Smash, Strength, Mega Punch, Mega Kick, Body Slam, Take Down, Double-Edge, Submission, Counter, Seismic Toss, Rage, Teleport, Mimic, Bide, Metronome, Skull Bash, Psywave
Unique Gen 7 Pre Evo Moves? - YES, Uproar

Magmar
Unique Gen 1-2 Evolution Moves? - YES, Rock Smash, Strength, Mega Punch, Mega Kick, Body Slam, Take Down, Double-Edge, Submission, Counter, Seismic Toss, Rage, Teleport, Mimic, Bide, Metronome, Skull Bash, Psywave
Unique Gen 7 Pre Evo Moves? - YES, Uproar

Vaporeon
Unique Gen 1-2 Evolution Moves? - YES, Whirlpool, BubbleBeam, Mist
Unique Gen 7 Pre Evo Moves? - YES, Covet, Refresh, Charm*, Baton Pass*, Trump Card
Note: There is more to this Pokemon’s legality. See the next section.

Jolteon
Unique Gen 1-2 Evolution Moves? - YES, Zap Cannon, Flash
Unique Gen 7 Pre Evo Moves? - YES, Covet, Refresh, Charm*, Baton Pass*, Trump Card
Note: There is more to this Pokemon’s legality. See the next section.

Flareon
Unique Gen 1-2 Evolution Moves? - YES, Leer, Zap Cannon
Unique Gen 7 Pre Evo Moves? - YES, Covet, Refresh, Charm*, Baton Pass*, Trump Card
Note: There is more to this Pokemon’s legality. See the next section.

Politoed
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Mud-Slap
Unique Gen 7 Pre Evo Moves? - YES, Water Sport, Mud Shot, Wake-up Slap, Mud Bomb

Espeon
Unique Gen 1-2 Evolution Moves? - YES, Zap Cannon, Nightmare, Cut, Flash
Unique Gen 7 Pre Evo Moves? - YES, Covet, Refresh, Charm*, Baton Pass*, Trump Card
Note: There is more to this Pokemon’s legality. See the next section.

Umbreon
Unique Gen 1-2 Evolution Moves? - YES, Zap Cannon, Nightmare, Cut, Flash
Unique Gen 7 Pre Evo Moves? - YES, Covet, Refresh, Charm*, Baton Pass*, Trump Card
Note: There is more to this Pokemon’s legality. See the next section.

Slowking
Unique Gen 1-2 Evolution Moves? - YES, DynamicPunch, Rock Smash, Fury Cutter, Whirlpool
Unique Gen 7 Pre Evo Moves? - YES, Slack Off

Steelix
Unique Gen 1-2 Evolution Moves? - YES, Rollout, Dragonbreath, Cut
Unique Gen 7 Pre Evo Moves? - YES, Sand Tomb

Scizor
Unique Gen 1-2 Evolution Moves? - YES, Strength
Unique Gen 7 Pre Evo Moves? - YES, Vacuum Wave, Air Slash

Hitmontop
Unique Evolution Moves? - YES, Dig
Unique Pre Evo Moves? - YES, Fake Out, Foresight, Uproar
Pokemon I checked that seemed likely to have problems, that ended up having no problems:
Code:
Raichu
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS (For Pikachu -> Raichu)

Gloom
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS (For Oddish -> Gloom)

Bellossom
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Ninetales
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Clefable
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS (For Clefable -> Clefairy)

Wigglytuff
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS (For Wigglytuff -> Jigglypuff)

Dodrio
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Poliwrath
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS


Cloyster
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Starmie
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Togetic
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - YES, Uproar
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Crobat
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - NO
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Sunflora
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - NO
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Donphan
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - Yes
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Dewgong
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - Yes
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Ursaring
Unique Gen 1-2 Evolution Moves? - NO
Unique Gen 7 Pre Evo Moves? - Yes
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Piloswine
Unique Gen 1-2 Evolution Moves? - NO, Horn Attack is inaccessible in VC
Unique Gen 7 Pre Evo Moves? - YES
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS

Tyranitar
Unique Gen 1-2 Evolution Moves? - YES
Unique Gen 7 Pre Evo Moves? - NO
NO PRE EVO MOVE + EVO OLD GEN LEGALITY PROBLEMS


Complicated Complications with VC Exclusive Attack + Pre Evo Gen 7 Attack Illegalities

Some combos are illegal for a pre evolution in Gen 2, but are legal in Gen 7. However, if an evolution does not also learn these now legal moves in Gen 7, it creates an interesting illegality situation.

A good example of this is Arcanine. All of Growlithe’s illegal move sets involve Crunch + a Gen 1 exclusive attack. Growlithe won’t have any movepool legality issues in Gen 7 because Growlithe can learn Crunch by level up. However, Arcanine doesn’t learn Crunch at all, it needs to learn the move by egg move or level up as a Growlithe. It can’t be relearned in Gen 7, unlike Growlithe. You can just evolve Growlithe and have that Crunch + Gen 1 Attack Arcanine, but you only have access to Growlithe’s Gen 1 attacks. You don’t have access to Arcanine’s Gen 1 exclusive attack Teleport. So even though it’s not legal in Gen 2, Crunch + Dragon Rage Growlithe is legal in Gen 7, and so is Crunch + Dragon Rage Arcanine, but Crunch + Teleport Arcanine is still illegal.

The relevant moves for this are:
Growlithe - Crunch, Egg move in Gen 2, Level Up in Gen 7
Eevee - Charm, Egg move in Gen 2, Level Up in Gen 7
Eevee - Double-Edge, TM in Gen 1, Level Up in Gen 7

Complicated Movepool Problems:

Code:
Arcanine:
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Teleport
Crunch + Double-Edge
Crunch + Rage
Crunch + Dragon Rage
Crunch + Mimic
Crunch + Reflect
Crunch + Bide
Crunch + Skull Bash

Vaporeon:
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Whirlpool, BubbleBeam, Mist
Charm + Body Slam
Charm + Double-Edge
Charm + Rage
Charm + Mimic
Charm + Reflect
Charm + Bide
Charm + Skull Bash
Flail + Double-Edge

Jolteon
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Zap Cannon, Flash
Charm + Body Slam
Charm + Double-Edge
Charm + Rage
Charm + Mimic
Charm + Reflect
Charm + Bide
Charm + Skull Bash
Flail + Double-Edge

Flareon
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Leer, Zap Cannon
Charm + Body Slam
Charm + Double-Edge
Charm + Rage
Charm + Mimic
Charm + Reflect
Charm + Bide
Charm + Skull Bash
Flail + Double-Edge

Espeon
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Zap Cannon, Nightmare, Cut, Flash
Charm + Body Slam
Charm + Double-Edge
Charm + Rage
Charm + Mimic
Charm + Bide
Charm + Skull Bash
Flail + Double-Edge

Umbreon
The following combinations of moves are legal on their own but NOT legal if the move set also includes: Zap Cannon, Nightmare, Cut, Flash
Charm + Body Slam
Charm + Double-Edge
Charm + Rage
Charm + Mimic
Charm + Reflect
Charm + Bide
Charm + Skull Bash
Flail + Double-Edge
Move Relearner:

There is no move relearner in the Gen 2 VC release. In Gen 2 proper, Pokemon Stadium 2 can be used to reteach any move as needed. This creates a few movepool illegalities that don’t exist in Gen 2:

Arcanine - Flame Wheel + Teleport (Level 1 Gen 2 only attack + Gen 1 Evolution only TM)
Piloswine - Horn Attack (Level 1 attack, inaccessible)

Comments:

All of this is done disregarding Pokemon levels. Things like Level 15 Hydro Pump Gyarados are legal in Gen 2 proper, but not Gen 2 VC because of the Pokemon Stadium 2 move tutor. Most of this information isn’t relevant for Gen 7, however, since it’s all either played at level 100 or auto leveled to 50.

I realize that ultimately a lot of this information doesn’t have a ton of practical use competitively. Most of these illegal combos require very specific movesets and most involve attacks that are awful. Still, with moves like Teleport going from completely useless to competitively relevant like that, I felt it was important to still parse this info.

Notes on interesting situations:
  • Some moves are listed without any combo to them. These are moves the Pokemon is listed as being able to learn in Gen 2, but doesn’t actually have a way to learn. Think Head Smash Nosepass.
  • Yanma and Bellsprout only get Leech Life through breeding in Gen 7, not TM. All their illegalities around that move still stand.
  • Charmander gets Outrage by egg move in Gen 7, but it only gets Outrage by move tutor in B2W2 for some reason.
  • Metronome is an egg move for Snubbull, a field egg group Pokemon, but it cannot be Sketched in Gen II and has legality problems as a result.
  • Despite it being a TM in Gen 7, Lapras only learns Solar Beam in Gen 1
  • Raichu, Clefable, and Wigglytuff were monitored closely for complicated VC Exclusive problems because there was a potential for this sort of conundrum to impact them with their wide movepools and baby evolutions. However, they all have the same VC exclusive moves as their prior pre evolutions for any Gen 1-2 exclusive attacks.
  • For a while, I thought Focus Energy + Baton Pass would have been an illegal combo on Eevee due to being learned at the same level as Baton Pass with no access to a move relearner. I forgot about the breeding mechanic where two Pokemon of the same species who both have a level up attack will pass down the move if the offspring species also learns the move. Whoops! If you see any mention of that combo here, please let me know and I’ll delete it.
None of this was automated, so there's a very solid chance I've missed a few things. Please feel free to point them out and I'll update the post.

Edits:
12-29 - Fixed the error bwburke94 noticed
 
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