PoisonGround
Poison and Ground types: weaknesses, resistances and Pokémon
Poison and Ground Pokémon take double damage from Water, Ice, Ground and Psychic moves, resist Poison, Fighting, Bug, Rock and Fairy moves and are immune to Electric moves.
The balance is even: 4 weaknesses and 6 resistances or immunities.
Poison moves are super effective against Grass and Fairy and not very effective against Poison, Ground, Rock and Ghost. Ground moves are super effective against Fire, Electric, Poison, Rock and Steel and not very effective against Grass and Bug.
To beat these Pokémon, your best pick is Water, Ice and Ground moves. Avoid Poison, Fighting, Bug and Rock moves, which deal little or no damage.
There are 3 Pokémon with this combination, such as Nidoqueen, Nidoking and Clodsire.