FireRock
Fire/Rock weaknesses
Fire/Rock is weak to Water, Ground, Fighting and Rock, and takes 4× from Water and Ground.
When Fire/Rock Pokémon are hit
4×Hits hardest
2×Super effective
½×Not very effective
¼×Barely scratches it
Its two types separately
Multiply the two to get the result. For example, Water deals 2× × 2× = 4×.