"Haunter is a dangerous Pokémon. If one beckons you while floating in darkness, you must never approach it. This Pokémon will try to lick you with its tongue and steal your life away."
Haunter is easily one of the scariest Pokemon in history. And for that reason, it's been featured in a lot of ways. It's been used as on object to scare in both the anime and the manga, yet, it was also used to make people smile via the Haunter that Ash had. Regardless of which was you see it, it's a pretty powerful Pokemon.
Haunter's Basic Attacks are Lick, Sucker Punch, and Shadow Claw. While its Special Attacks are Ominous Wind, Dark Pulse and Sludge Bomb.