NormalRock
Normal/Rock weaknesses
Normal/Rock is weak to Fighting, Water, Grass, Ground and Steel, and takes 4× from Fighting.
When Normal/Rock 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, Fighting deals 2× × 2× = 4×.
No Pokémon is Normal/Rock yet
This combination hasn't appeared in any main game, including forms and Megas.