ground type Pokemon are super effective against poison type Pokemon.
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Psychic and ground type moves are super-effective against poison types I tried using fighting moves, and they were not very effective
Poison and Steel types are super effective against Fairy types.
Gengar is a ghost/poison type so... ghost and dark types are super effective against ghost types. ground and psychic types are super effective against poison types
Poison Type moves are super effective against only Grass Types.
Bug types are super effective against Dark, Grass and Psychic (x2) in Generation II-onward. In Generation I, they were super effective against Grass, Poison and Psychic.