Pokémon Trading Card Game - Koga's Muk - Gym: Challenge 26

Pokémon Power: Energy
Drain If an opponent's attack does damage to Koga's Muk (even if Muk is Knocked Out), flip a coin. If heads and if it has any, choose 1 Energy card attached to the attacking Pokémon and discard it. This power can't be used if Koga's Muk is already Asleep, Confused, or Paralyzed when your opponent attacks.

Sludge Whirlpool 40

LV.38 #89