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Abilities, attacks, weakness & resistance
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.
Other cards from Gym Challenge

Water Energy (Unlimited)

Water Energy (First Edition)

Psychic Energy (Unlimited)

Psychic Energy (First Edition)

Lightning Energy (Unlimited)

Lightning Energy (First Edition)

Grass Energy (Unlimited)

Grass Energy (First Edition)

Fire Energy (Unlimited)

Fire Energy (First Edition)

Fighting Energy (Unlimited)

Fighting Energy (First Edition)
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Koga's Muk (gym2-26 First Edition) is a Stage 1 Grass-type Pokémon from the Gym Challenge set featuring the Pokémon Power Energy Drain. Energy Drain can discard an Energy from an opponent's attacking Pokémon after damage is dealt, triggered by a coin flip and blocked if Muk is Asleep, Confused, or Paralyzed. Its attack Sludge Whirlpool deals 40 damage and the card carries a retreat cost of three Colorless energy, making it a mid-tempo control option that pressures opponent resources.
Catalog pricing data as of 21 Apr 2026, 22:33