GrassDragon
Grass and Dragon types: weaknesses, resistances and Pokémon
Grass and Dragon Pokémon take quadruple damage from Ice moves, take double damage from Poison, Flying, Bug, Dragon and Fairy moves and resist Water, Grass, Electric and Ground moves.
That is 6 weaknesses against 4 resistances, so these Pokémon rely on Speed or offensive power to make up for it.
Grass moves are super effective against Water, Ground and Rock and not very effective against Fire, Grass, Poison, Flying, Bug, Dragon and Steel. Dragon moves are super effective against Dragon and not very effective against Steel.
To beat these Pokémon, your best pick is Ice moves. Avoid Water, Grass, Electric and Ground moves, which deal little or no damage.
There are 5 Pokémon with this combination, such as Applin, Flapple, Appletun and Dipplin.