Well he uses Ground and Poison types.
So, generally use Ice, Psychic, Water, and Grass.
But if you use Grass type attacks on Nidoking or Nidoqueen, Poison-ground types, they take normal damage.
he uses ground type so use water and ice type and fire or just use the legendary bird trio if you have catched them
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flying type psychic type
poison fire flying and ice
EDIT: and dark. physical
They can oly be defeated by their pokemons weakness so if you buy a few max potions and revives then you and have 1 of each really just not normal type
Both. If your attack is good against another pokemons TYPE then it will be super effective. If your pokemons type resists their attack then it will be not very effective. Water attack is super effective against fire.