Poison
Poison type: weaknesses, resistances and Pokémon
Poison Pokémon take double damage from Ground and Psychic moves and resist Grass, Fighting, Poison, Bug and Fairy moves.
The balance is even: 2 weaknesses and 5 resistances or immunities.
Poison moves are super effective against Grass and Fairy and not very effective against Poison, Ground, Rock and Ghost.
To beat these Pokémon, your best pick is Ground and Psychic moves. Avoid Grass, Fighting, Poison and Bug moves, which deal little or no damage.
There are 16 Pokémon with this combination, such as Ekans, Arbok, Nidoran F and Nidorina.
Pokémon with Poison as one of their types: 83