GrassDark
Grass/Dark weaknesses
Grass/Dark is weak to Bug, Fire, Ice, Fighting, Poison, Flying and Fairy, and takes 4× from Bug.
When Grass/Dark Pokémon are hit
4×Hits hardest
2×Super effective
½×Not very effective
0×No effect
Its two types separately
Multiply the two to get the result. For example, Bug deals 2× × 2× = 4×.