Does 20 damage times the total number of Koffings, Weezings, and Dark Weezings in play (Apply Weakness and Resistance.). Then, this attack does 20 damage to each Koffing, Weezing, and Dark Weezing (even your own). Don't apply Weakness and Resistance.
Grass · Grass · Grass
Stun Gas 20
Flip a coin. If heads, the Defending Pokémon is now Poisoned; if tails, the Defending Pokémon is now Paralyzed.
Battle profile
WeaknessPsychic ×2
Pokédex entry
Researchers have observed these Pokémon reproducing in industrial waste sites.
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