Koga's Muk (Gym Challenge 26/132)
Pokémon Power Energy Drain

If an opponent's attack does damage to Koga's Muk (even if Koga's 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.

Grass Grass Colorless
Sludge Whirlpool