12.
Ghosts are awesome. And mostly evil. Think about it. The whole Gengar line eat the dreams of children; they can't help themselves, Frosslass kidnaps people and takes them to ice caves, presumably to eat their souls, Spiritomb was bound for something unspeakably evil, Drifblim steals children, Misdreavus has a necklace made of souls, Banette seeks to steal the soul of the child who discarded it...
What is it with ghosts and children?