PoisonFairy
Poison and Fairy types: weaknesses, resistances and Pokémon
Poison and Fairy Pokémon take double damage from Ground, Psychic and Steel moves, resist Fighting, Bug, Grass, Dark and Fairy moves and are immune to Dragon moves.
The balance is even: 3 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. Fairy moves are super effective against Fighting, Dragon and Dark and not very effective against Fire, Poison and Steel.
To beat these Pokémon, your best pick is Ground, Psychic and Steel moves. Avoid Fighting, Bug, Grass and Dark moves, which deal little or no damage.
There is 1 Pokémon with this combination, such as Fezandipiti.