Samurott

Ability — Torrential Whirlpool: Once during your turn, you may switch your Active Pokémon with 1 of your Benched Pokémon. If you do, switch out your opponent's Active Pokémon to the Bench. (Your opponent chooses the new Active Pokémon.)

Energized Slash (30+): This attack does 50 more damage for each Energy attached to this Pokémon.