Psychic type Pokémon. An example is Metagross, as Metagross is a dual steel and psychic type Pokémon, meaning you'll be able to destroy virtually any poison type Pokémon and take no damage from poison type attacks at the same time.
Poison is strong against grass type Pokémon.
Flying, Poison, Bug, Fire, and Ice type moves are strong against a Grass type Pokemon.
Poison and Steel type moves are good against Fairy type Pokemon.
Poison types are weak against Ground and Psychic types.
Poison, rock and electric.
Fighting types are weak against psychic and flying types.
Poison-Type moves are only strong against Grass-Types. Poison-Type Pokémon are strong against Grass-Types, Bug-Types, Fighting-Types, and other Poison-Types.
ground type Pokemon are super effective against poison type Pokemon.
ground and physic Pokemon are super effective against poison Pokemon
Poison is strong against Grass. It's weak against Poison, Ground, Rock, and Ghost. It can't affect Steel. Ground and Psychic are strong against Poison. Grass, Fighting, Poison, and Bug are weak against Poison.
Strong ground and psychic Pokemon such as Claydol, Metagross, and Tyranitar. Both ground and psychic moves are super-effective against poison. They are both multiplied by 2. A good ground type move is earthquake, but since many poison Pokemon have levitate or are flying, they can avoid this. It depends on dual types, abilities, available moves, etc., of both Pokemon, but the strongest Pokemon against poison Pokemon generally would be the strongest psychic and ground Pokemon. Some excellent psychic and ground Pokemon (strongest is quite subjective, so there's no definite answer) are Metagross and Tyranitar, respectively. Claydol is a strong Psychic and Ground dual-type Pokemon.
grass,poison think that's it