EDIT: Not a bug, see below.
Protect-like moves only reduce Z-Move damage if the Z-move is caused by using a Z-crystal; CFZs do not have their damage reduced by Protect. I believe this has been occurring for several weeks, but I only just validated the specifics. It's possible that this change was a correction to reflect new research on how CFZs behave when hacked into a real USUM cart game, but as this seems pretty unlikely and I am unable to test the cart behaviour myself, I am reporting this as a bug.
Example:-
Z-Crystal case:-
https://replay.pokemonshowdown.com/gen7customgame-883921496
CFZ case:-
https://replay.pokemonshowdown.com/gen7customgame-883922534
It may not have been clear to a programmer that this is a situation that could occur in a real game outside of very rare Hackmons Cup cases. However, it has a very significant impact on balance in the format Pure Hackmons which runs format tours (e.g. https://www.smogon.com/forums/threads/pure-hackmons-tour.3647638/ ), so this is a competitively meaningful bug.
Protect-like moves only reduce Z-Move damage if the Z-move is caused by using a Z-crystal; CFZs do not have their damage reduced by Protect. I believe this has been occurring for several weeks, but I only just validated the specifics. It's possible that this change was a correction to reflect new research on how CFZs behave when hacked into a real USUM cart game, but as this seems pretty unlikely and I am unable to test the cart behaviour myself, I am reporting this as a bug.
Example:-
(Z-Crystal Attacker)
Kommo-o @ Kommonium Z
Ability: Overcoat
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Clanging Scales
- Close Combat
- Stealth Rock
- Taunt
(CFZ Attacker)
Kommo-o @ Kommonium Z
Ability: Overcoat
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Clangorous Soulblaze
- Close Combat
- Stealth Rock
- Taunt
(Defender)
Alomomola @ Rocky Helmet
Ability: Regenerator
EVs: 40 HP / 252 Def / 216 SpD
Bold Nature
- Wish
- Protect
- Toxic
- Scald
Kommo-o @ Kommonium Z
Ability: Overcoat
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Clanging Scales
- Close Combat
- Stealth Rock
- Taunt
(CFZ Attacker)
Kommo-o @ Kommonium Z
Ability: Overcoat
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Clangorous Soulblaze
- Close Combat
- Stealth Rock
- Taunt
(Defender)
Alomomola @ Rocky Helmet
Ability: Regenerator
EVs: 40 HP / 252 Def / 216 SpD
Bold Nature
- Wish
- Protect
- Toxic
- Scald
Z-Crystal case:-
https://replay.pokemonshowdown.com/gen7customgame-883921496
CFZ case:-
https://replay.pokemonshowdown.com/gen7customgame-883922534
It may not have been clear to a programmer that this is a situation that could occur in a real game outside of very rare Hackmons Cup cases. However, it has a very significant impact on balance in the format Pure Hackmons which runs format tours (e.g. https://www.smogon.com/forums/threads/pure-hackmons-tour.3647638/ ), so this is a competitively meaningful bug.
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