FightingPoison
Fighting and Poison types: weaknesses, resistances and Pokémon
Fighting and Poison Pokémon take quadruple damage from Psychic moves, take double damage from Ground and Flying moves and resist Bug, Grass, Fighting, Poison, Rock and Dark moves.
The balance is even: 3 weaknesses and 6 resistances or immunities.
Fighting moves are super effective against Normal, Ice, Rock, Dark and Steel and not very effective against Poison, Flying, Psychic, Bug and Fairy. 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 Psychic moves. Avoid Bug, Grass, Fighting and Poison moves, which deal little or no damage.
There are 4 Pokémon with this combination, such as Croagunk, Toxicroak, Sneasler and Okidogi.