Darkrai, despite what the movies say, causes crippling night terrors.
Even in-game, it's confirmed that the nightmares are an unintentional defense mechanism.
Kabutops are vampires.
So are Litwick and Jellicent, actually.
Yeah, most Ghost-types are evil. Froslass intentionally lead hikers through blizzards and leave them where they can't find their way back. --- "Well, you know the old saying: When life gives you lemons... go murder a clown." --Festus Krex