FireFairy
Fire/Fairy weaknesses
Fire/Fairy is weak to Water, Poison, Ground and Rock.
When Fire/Fairy Pokémon are hit
2×Super effective
½×Not very effective
¼×Barely scratches it
0×No effect
Its two types separately
Multiply the two to get the result. For example, Water deals 2× × 1× = 2×.
No Pokémon is Fire/Fairy yet
This combination hasn't appeared in any main game, including forms and Megas.