Weezing

Where two kinds of poison gases meet, two Koffings can fuse into a Weezing over many years.

Smog (20): Flip a coin. If heads, the Defending Pokémon is now Poisoned.

Selfdestruct (60): Does 10 damage to each Pokémon on each player's Bench. (Don't apply Weakness and Resistance for Benched Pokémon.) Weezing does 60 damage to itself.