Ghost-type Pokemon are weak against Ghost and Dark types.
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Bug, dark and ghost.
As of Generation 5 only the pokemon Spiritomb has no weakness because of the dual-type Ghost/Dark.
Ghost types are weak against other Ghost type moves along with Dark type moves.
Gastly is a ghost/ poison type, so any psychic or ghost type will be super effective against it.
Golurk is a Ground/Ghost-type Pokemon, so it's weak to Water, Grass, Ice, Dark, and Ghost attacks.