Well, this is a bit of a cheesy counter, but defensive Vaporeon doesn't give a crap about Gyarados. Roar Suicune does the same thing, but it has no ability to support its team.
Vaporeon @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Wish
- Protect
- Scald
- Roar / Haze / Heal Bell <-- only if it is this particular set.
Waterfall heals you. You can just wish+protect stall Bounce. Roar away subs and boosts.
I expect that a lot of the checks people will list will ignore the possibility of earthquake, crunch, or ice fang. If not, then any water immune pokemon with protect is a hardwall.
+1 252 Atk Gyarados Earthquake vs. 252 HP / 252+ Def Vaporeon: 157-185 (33.8 - 39.8%) -- 27.5% chance to 3HKO after Leftovers recovery
A more exciting counter is SubSeed Whimsicott, though someone else can claim this if only one submission is allowed.
Whimsicott @ Leftovers
Ability: Prankster
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
IVs: 0 Atk
- Substitute
- Leech Seed
- Encore
- Moonblast
Unless Gyarados runs Ice Fang and predicts the switch. It just gets encored and stalled.
252 Atk Gyarados Waterfall vs. 248 HP / 252+ Def Whimsicott: 51-60 (15.7 - 18.5%) -- possible 8HKO after Leftovers recovery
Breaks subs
0 SpA Whimsicott Moonblast vs. 0 HP / 0 SpD Gyarados: 84-99 (25.3 - 29.9%) -- guaranteed 4HKO
Vaporeon @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Wish
- Protect
- Scald
- Roar / Haze / Heal Bell <-- only if it is this particular set.
Waterfall heals you. You can just wish+protect stall Bounce. Roar away subs and boosts.
I expect that a lot of the checks people will list will ignore the possibility of earthquake, crunch, or ice fang. If not, then any water immune pokemon with protect is a hardwall.
+1 252 Atk Gyarados Earthquake vs. 252 HP / 252+ Def Vaporeon: 157-185 (33.8 - 39.8%) -- 27.5% chance to 3HKO after Leftovers recovery
A more exciting counter is SubSeed Whimsicott, though someone else can claim this if only one submission is allowed.
Whimsicott @ Leftovers
Ability: Prankster
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
IVs: 0 Atk
- Substitute
- Leech Seed
- Encore
- Moonblast
Unless Gyarados runs Ice Fang and predicts the switch. It just gets encored and stalled.
252 Atk Gyarados Waterfall vs. 248 HP / 252+ Def Whimsicott: 51-60 (15.7 - 18.5%) -- possible 8HKO after Leftovers recovery
Breaks subs
0 SpA Whimsicott Moonblast vs. 0 HP / 0 SpD Gyarados: 84-99 (25.3 - 29.9%) -- guaranteed 4HKO
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