Assault Vest is bad, (on gyarados) plain and simple. With Moxie you lose out on the Intimidate to at least give you some life. You claim that it can late game sweep, yeah, maybe when everything is at 10%. It's slow, doesn't go good against Stall, still gets forced out by electrics. To top it off, it doesn't get any physical bulk from Intimidate and why would you capitalize on Gyara's semi decent special bulk instead of going for Attack? ?_? AV Conk still invests into Attack! With such low punch force, a late game sweep will almost never happen and since a lot of the metagame is outspeeding you how can you accumulate boosts? Moxie is a cool ability on Offensive Dragon Dance sets, but seriously.
Friendly reminder that slapping AV on a mon calling it a special wall and calling it a day isn't exactly great, even worse when you say it's a sweeper.
Friendly reminder that slapping AV on a mon calling it a special wall and calling it a day isn't exactly great, even worse when you say it's a sweeper.