Grass and Fairy types: weaknesses, resistances and Pokémon
Grass and Fairy Pokémon take quadruple damage from Poison moves, take double damage from Fire, Ice, Flying and Steel moves, resist Water, Grass, Electric, Fighting, Ground and Dark moves and are immune to Dragon moves.
The balance is even: 5 weaknesses and 7 resistances or immunities.
Grass moves are super effective against Water, Ground and Rock and not very effective against Fire, Grass, Poison, Flying, Bug, Dragon and Steel. 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 Poison moves. Avoid Water, Grass, Electric and Fighting moves, which deal little or no damage.
There are 5 Pokémon with this combination, such as Cottonee, Whimsicott, Morelull and Shiinotic.