If one of the twin Koffing inflates, the other one deflates. It constantly mixes its poisonous gases.
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Artist
As long as this Pokémon is your Active Pokémon, put 1 damage counter on each of your opponent's Basic Pokémon between turns.
Colorless • Colorless
This attack does 20 damage to each of your opponent's Benched Pokémon that has any damage counters on it. (Don't apply Weakness and Resistance for Benched Pokémon.)