Toxicroak

Its knuckle claws secrete a toxin so vile that even a scratch could prove fatal.

Poke-BODY — Poison Sacs: Your opponent can't remove the Special Condition Poisoned by evolving or devolving his or her Poisoned Pokémon. (This also includes putting a Pokémon Level-Up card onto the Poisoned Pokémon.)

Knuckle Claws (30): The Defending Pokémon is now Poisoned.