-Gengar-

Gengar, Gastly, and Haunter were in a haunted castle, and you entered to investigate what happened to the family that lived there. When you see a chair at the end of the hallway, the chair begins to move on its own toward the kitchen and you get scared, obviously, because there are three ghost Pokémon—Gastly, Haunter, and Gengar—and they are hiding in the walls where you can't see them.