IcePoison
Ice/Poison weaknesses
Ice/Poison is weak to Fire, Ground, Psychic, Rock and Steel.
When Ice/Poison Pokémon are hit
2×Super effective
½×Not very effective
Its two types separately
Multiply the two to get the result. For example, Fire deals 2× × 1× = 2×.
No Pokémon is Ice/Poison yet
This combination hasn't appeared in any main game, including forms and Megas.