Haunter

It licks with its gaseous tongue to steal the victim's life force. It lurks in darkness for prey.

Ability — Gothic Fear: When you play this Pokémon from your hand to evolve 1 of your Pokémon, you may leave both Active Pokémon Confused.

Poison Ring: Your opponent's Active Pokémon is now Poisoned. That Pokémon can't retreat during your opponent's next turn.