FirePoison
Fire/Poison weaknesses
Fire/Poison is weak to Ground, Water, Psychic and Rock, and takes 4× from Ground.
When Fire/Poison 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, Ground deals 2× × 2× = 4×.