Psychic and ghost are very effective. My friend code I'd 4470-0255-2119
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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
Ghost types are weak against Dark and Ghost type moves.
dark and ghost types are both super effective against ghost types
Dark, and ghost.
Flying and Psychic types are good against Fighting types.