Muk PL 57

If Muk remains affected by any Special Conditions between turns, remove 2 damage counters from Muk.

Flip a coin. If heads, the Defending Pokémon is now Poisoned. If tails, Muk is now Poisoned.

If Muk is Poisoned, this attack does 50 damage plus 20 more damage and the Defending Pokémon is now Confused.