For starters Hypno could make you do anything he wanted and he is creepy just in general and he sleeps right by you.Abrakazam is a psick type like hypno and for starters both pokemon are insanely powerful by how they can teleport and hypnotize pretty much anything living.
And Darkrai he causes nightmares that are endless so this pokemon is pretty much a pokemon version of Freddy Krueger. One more thing if this pokemon did exist then it would be a living ghost.
A Yamask is one of the worst because they use to be HUMANS, who died and became a pokemon but the creepy part is that its mask is its humans old face! When it