This is my second RMT which has detailed info. I made it as detailed as possible due to my first being banned for being very low detailed. So here we go:
Heatran @ Air Balloon
Flash Fire
Modest nature (+Sp. Attack, -Attack)
EVs: 252 Spd / 252 Sp. Atk / 6 Sp. Def
Fire Blast
Earth Power
Hidden Power Ice
Stealth Rock
Heatran is an incredible offensive threat in this metagame, and can find time to come in on a variety of threats and scare them out. Fire Blast is Heatran's main STAB, plowing through things that don't resist it. Earth Power is for coverage, and allows Heatran to come in on other Heatran whose Balloons have been popped, and kill them. Hidden Power Ice allows it to kill Dragons. In the last slot, I've got Stealth Rock, which is probably the best move in the entire game, since it hurts every Pokemon that the opponent will switch in (except Magic Guard Pokemon) for some damage. Heatran can come in on the extremely common Ferrothorn to set this up, as well as a variety of other Pokemon that get scared away.
Now that we have Heatran, let's consider Pokemon that would do well with it. Heatran has a huge weakness to Water and Fighting moves, so a great partner would be Jellicent, immune to both of those types of attacks!
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Jellicent @ Leftovers
Water Absorb
Bold nature (+Defense, -Attack)
EVs: 248 HP/ 46 Spd / 216 Def
Scald
Recover
Toxic / Will-O-Wisp
Taunt
Jellicent is bulky defensive Pokemon. Scald is a good STAB with a 30% Burn ratio. Recover keeps Jellicent alive. Toxic will break down opposing specially defensive Pokemon, while Taunt stops the opponent from doing anything except direct attacking, which will help ensure Jellicent isn't Poisoned, and that the opponent can't recover. Will-O-Wisp, on the other hand, is a more safe way to ensure you Burn an opponent, cutting their Attack in half. The EVs outspeed Scizor to try to Burn it before it can hit you. For the sake of this example, I'm picking Will-O-Wisp.
Now we have two Pokemon, Heatran and Jellicent. We need a physically offensive Pokemon, or else special walls like Blissey will wall us forever. Dragonite has good synergy with both Heatran and Jellicent, taking Fighting and Ground attacks for the former, and absorbing Grass attacks for the latter.
Dragonite @ Leftovers
Multiscale
Adamant nature (+Attack, -Sp. Attack)
EVs: 252 HP / 44 Atk / 212 Spd
Dragon Dance
Dragon Claw
Fire Punch / Earthquake
Roost
Bulky Dragon Dance Dragonite is both an offensive and defensive force to be reckoned with. After a Dragon Dance, Dragonite can Roost off damage and begin wearing opposing Pokemon down. Dragon Claw is your main STAB move. Fire Punch hits Steel types like Ferrothorn, Skarmory and Air Balloon Magnezone, but leaves it helpless against the likes of Heatran. Earthquake hits Heatran, Terrakion, Tyranitar and some others harder than Dragon Claw would. Roost not only keeps Dragonite alive, but activates Multiscale at 100% health, which allows Dragonite to take 50% less damage from attacks when at 100% health. Since we have Heatran for Fire attacks, I'm picking Earthquake.
Heatran/Jellicent/Dragonite. This is a pretty solid core already. What I'd like to incorporate is a Choice Scarfed Pokemon. Choice Scarfed Pokemon serve an important function, not only to revenge kill an opponent after one of your Pokemon faints, but to kill Speed boosting Pokemon before they get too fast. For this, I love Terrakion, who is already naturally fast.
Terrakion @ Choice Scarf
Justified
Jolly nature (+Speed, -Sp. Attack)
EVs: 6 HP / 252 Atk / 252 Spd
Close Combat
Stone Edge
X-Scissor
Rock Slide
Terrakion can come in on things like Salamence and Dragonite with one Dragon Dance, outspeed them, and crush them with Stone Edge. Close Combat and Stone Edge are both excellent STAB moves that hit many, many Pokemon for absurd amounts of damage. X-Scissor is good for dealing with weakened Psychic types like Latias and Latios. Rock Slide is in the last slot for two reasons: It can more reliably kill weakened Pokemon that are weak to Rock, since Stone Edge has risky 80% accuracy. The second reason is that Terrakion has a pretty shallow movepool, so it can't really do much else.
Now we've got Heatran, Jellicent, Dragonite, Terrakion. I'd like another defensive Pokemon, because Jellicent can't handle everything itself. A Pokemon with good defensive synergy with Jellicent (and just about everything) is Ferrothorn, since Jellicent resists Fire and is immune to Fighting, while Ferrothorn can take Electric and Grass attacks aimed at Jellicent.
Ferrothorn @ Leftovers
Iron Barbs
Impish nature (+Defense, -Sp. Attack)
EVs: 252 HP / 88 Def / 170 Sp. Def
Spikes
Leech Seed
Protect / Thunder Wave
Power Whip
Ferrothorn is a team player if there ever was one. Spikes can stack up to three layers, which will chip a total of 25% off any opponents Pokemon that aren't Flying type, have Levitate and/or have Magic Guard. Leech Seed keeps Ferrothorn alive, sapping the opponent's health and returning it to Ferrothorn, and can be used to ease the switch to one of your own Pokemon. Protect allows you to scout what the opponent will do, and rack up more Leftovers and Leech Seed healing. Thunder Wave on the other hand will Paralyze anything the opponent brings in (barring Ground types), which can cripple common switches such as Heatran, Dragonite, etc. Power Whip is a strong STAB that can deal sufficient damage, should Ferrothorn find itself in a position where it has to do some damage.
Heatran, Jellicent, Dragonite, Terrakion, Ferrothorn. We've got one slot left, and we already have a very solid team built. What I'd like to add is a Pokemon that can serve as an offensive pivot.
Scizor @ Choice Band
Technician
Adamant nature (+Attack, -Sp. Attack)
EVs: 252 Atk / 248 HP/ 8 Spd
U-Turn
Bullet Punch
Superpower
Pursuit
U-Turn is the pivot move here, doing damage, and allowing us to immediately escape. Why is this useful? Because Scizor tends to cause a lot of switches, so you can hit whatever the opponent switches in with a powerful STAB U-Turn, and immediately escape to something that handles what they switched in better than Scizor does. Bullet Punch is our other STAB move, which is boost not only by STAB, but by Technician and Choice Band, making it the most powerful move we've got. It also has priority, meaning it'll hit the opponent before they can hit us. Superpower smashes things like Magnezone, Ferrothorn and Heatran switch-ins that expect Bullet Punch or U-Turn, OHKOing all of them. Pursuit traps Psychic types that flee in fear of U-Turn.
That's all thanks to all in advance who helps.
Heatran @ Air Balloon
Flash Fire
Modest nature (+Sp. Attack, -Attack)
EVs: 252 Spd / 252 Sp. Atk / 6 Sp. Def
Fire Blast
Earth Power
Hidden Power Ice
Stealth Rock
Heatran is an incredible offensive threat in this metagame, and can find time to come in on a variety of threats and scare them out. Fire Blast is Heatran's main STAB, plowing through things that don't resist it. Earth Power is for coverage, and allows Heatran to come in on other Heatran whose Balloons have been popped, and kill them. Hidden Power Ice allows it to kill Dragons. In the last slot, I've got Stealth Rock, which is probably the best move in the entire game, since it hurts every Pokemon that the opponent will switch in (except Magic Guard Pokemon) for some damage. Heatran can come in on the extremely common Ferrothorn to set this up, as well as a variety of other Pokemon that get scared away.
Now that we have Heatran, let's consider Pokemon that would do well with it. Heatran has a huge weakness to Water and Fighting moves, so a great partner would be Jellicent, immune to both of those types of attacks!
Jellicent @ Leftovers
Water Absorb
Bold nature (+Defense, -Attack)
EVs: 248 HP/ 46 Spd / 216 Def
Scald
Recover
Toxic / Will-O-Wisp
Taunt
Jellicent is bulky defensive Pokemon. Scald is a good STAB with a 30% Burn ratio. Recover keeps Jellicent alive. Toxic will break down opposing specially defensive Pokemon, while Taunt stops the opponent from doing anything except direct attacking, which will help ensure Jellicent isn't Poisoned, and that the opponent can't recover. Will-O-Wisp, on the other hand, is a more safe way to ensure you Burn an opponent, cutting their Attack in half. The EVs outspeed Scizor to try to Burn it before it can hit you. For the sake of this example, I'm picking Will-O-Wisp.
Now we have two Pokemon, Heatran and Jellicent. We need a physically offensive Pokemon, or else special walls like Blissey will wall us forever. Dragonite has good synergy with both Heatran and Jellicent, taking Fighting and Ground attacks for the former, and absorbing Grass attacks for the latter.
Dragonite @ Leftovers
Multiscale
Adamant nature (+Attack, -Sp. Attack)
EVs: 252 HP / 44 Atk / 212 Spd
Dragon Dance
Dragon Claw
Fire Punch / Earthquake
Roost
Bulky Dragon Dance Dragonite is both an offensive and defensive force to be reckoned with. After a Dragon Dance, Dragonite can Roost off damage and begin wearing opposing Pokemon down. Dragon Claw is your main STAB move. Fire Punch hits Steel types like Ferrothorn, Skarmory and Air Balloon Magnezone, but leaves it helpless against the likes of Heatran. Earthquake hits Heatran, Terrakion, Tyranitar and some others harder than Dragon Claw would. Roost not only keeps Dragonite alive, but activates Multiscale at 100% health, which allows Dragonite to take 50% less damage from attacks when at 100% health. Since we have Heatran for Fire attacks, I'm picking Earthquake.
Heatran/Jellicent/Dragonite. This is a pretty solid core already. What I'd like to incorporate is a Choice Scarfed Pokemon. Choice Scarfed Pokemon serve an important function, not only to revenge kill an opponent after one of your Pokemon faints, but to kill Speed boosting Pokemon before they get too fast. For this, I love Terrakion, who is already naturally fast.
Terrakion @ Choice Scarf
Justified
Jolly nature (+Speed, -Sp. Attack)
EVs: 6 HP / 252 Atk / 252 Spd
Close Combat
Stone Edge
X-Scissor
Rock Slide
Terrakion can come in on things like Salamence and Dragonite with one Dragon Dance, outspeed them, and crush them with Stone Edge. Close Combat and Stone Edge are both excellent STAB moves that hit many, many Pokemon for absurd amounts of damage. X-Scissor is good for dealing with weakened Psychic types like Latias and Latios. Rock Slide is in the last slot for two reasons: It can more reliably kill weakened Pokemon that are weak to Rock, since Stone Edge has risky 80% accuracy. The second reason is that Terrakion has a pretty shallow movepool, so it can't really do much else.
Now we've got Heatran, Jellicent, Dragonite, Terrakion. I'd like another defensive Pokemon, because Jellicent can't handle everything itself. A Pokemon with good defensive synergy with Jellicent (and just about everything) is Ferrothorn, since Jellicent resists Fire and is immune to Fighting, while Ferrothorn can take Electric and Grass attacks aimed at Jellicent.
Ferrothorn @ Leftovers
Iron Barbs
Impish nature (+Defense, -Sp. Attack)
EVs: 252 HP / 88 Def / 170 Sp. Def
Spikes
Leech Seed
Protect / Thunder Wave
Power Whip
Ferrothorn is a team player if there ever was one. Spikes can stack up to three layers, which will chip a total of 25% off any opponents Pokemon that aren't Flying type, have Levitate and/or have Magic Guard. Leech Seed keeps Ferrothorn alive, sapping the opponent's health and returning it to Ferrothorn, and can be used to ease the switch to one of your own Pokemon. Protect allows you to scout what the opponent will do, and rack up more Leftovers and Leech Seed healing. Thunder Wave on the other hand will Paralyze anything the opponent brings in (barring Ground types), which can cripple common switches such as Heatran, Dragonite, etc. Power Whip is a strong STAB that can deal sufficient damage, should Ferrothorn find itself in a position where it has to do some damage.
Heatran, Jellicent, Dragonite, Terrakion, Ferrothorn. We've got one slot left, and we already have a very solid team built. What I'd like to add is a Pokemon that can serve as an offensive pivot.
Scizor @ Choice Band
Technician
Adamant nature (+Attack, -Sp. Attack)
EVs: 252 Atk / 248 HP/ 8 Spd
U-Turn
Bullet Punch
Superpower
Pursuit
U-Turn is the pivot move here, doing damage, and allowing us to immediately escape. Why is this useful? Because Scizor tends to cause a lot of switches, so you can hit whatever the opponent switches in with a powerful STAB U-Turn, and immediately escape to something that handles what they switched in better than Scizor does. Bullet Punch is our other STAB move, which is boost not only by STAB, but by Technician and Choice Band, making it the most powerful move we've got. It also has priority, meaning it'll hit the opponent before they can hit us. Superpower smashes things like Magnezone, Ferrothorn and Heatran switch-ins that expect Bullet Punch or U-Turn, OHKOing all of them. Pursuit traps Psychic types that flee in fear of U-Turn.
That's all thanks to all in advance who helps.