IceGhost
Ice and Ghost types: weaknesses, resistances and Pokémon
Ice and Ghost Pokémon take double damage from Fire, Rock, Ghost, Dark and Steel moves, resist Ice, Poison and Bug moves and are immune to Normal and Fighting moves.
The balance is even: 5 weaknesses and 5 resistances or immunities.
Ice moves are super effective against Grass, Ground, Flying and Dragon and not very effective against Fire, Water, Ice and Steel. Ghost moves are super effective against Psychic and Ghost and not very effective against Dark.
To beat these Pokémon, your best pick is Fire, Rock and Ghost moves. Avoid Ice, Poison, Bug and Normal moves, which deal little or no damage.
There is 1 Pokémon with this combination, such as Froslass.