PokÃ©-Body Hidden Poison
If Haunter is your Active PokÃ©mon and is damaged by an opponent's attack (even if Haunter is Knocked Out), the Attacking PokÃ©mon is now Poisoned.
Choose 1 of your opponent's PokÃ©mon. This attack does 20 damage to that PokÃ©mon. (Don't apply Weakness and Resistance for Benched PokÃ©mon.)