NormalPoison
Normal and Poison types: weaknesses, resistances and Pokémon
Normal and Poison Pokémon take double damage from Ground and Psychic moves, resist Grass, Poison, Bug and Fairy moves and are immune to Ghost moves.
The balance is even: 2 weaknesses and 5 resistances or immunities.
Normal moves are super effective against no type and not very effective against Rock and Steel. 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, Poison, Bug and Fairy moves, which deal little or no damage.
There are 2 Pokémon with this combination, such as Shroodle and Grafaiai.