Wishiwashi GRI 37

Once during your turn (before your attack), you may switch this Pokémon with a Wishiwashi-GX in your hand. Any attached cards, damage counters, Special Conditions, turns in play, and any other effects remain on the new Pokémon.

This attack does 10 damage to 1 of your opponent's Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)