Ability: Detention Gas
As long as this Pokémon is your Active Pokémon, put 1 damage counter on each of your opponent’s Basic Pokémon between turns.
[C][C] Splattering Sludge: 40
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.)
If one of the twin Koffing inflates, the other one deflates. It constantly mixes its poisonous gases.