Poison type Pokemon are weak against psychic types and ground (unless flying as it doesn't affect). Trust me I beat lv. 51 golbat with my lugias extrasensory.
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ground type Pokemon are super effective against poison type Pokemon.
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.
Drapion is a Dark/Poison-type Pokemon. Ground-type moves are super effective against it. Drapion is immune to Psychic-type attacks.
Poison Type moves are super effective against only Grass Types.