Poliwrath might be a thing in Rain with Z-Splash?
Poliwrath @ Normalium Z
Ability: Swift Swim
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant/Jolly Nature
- Splash
- Brick Break/Power Up Punch
- Earthquake/Ice Punch/Poison Jab
- Waterfall
Atk after Z-Splash (Adamant): 793 Atk
With Jolly...