Steel is super effective against rock type pokemon.
ground type Pokemon are super effective against poison type Pokemon.
Rock, electric and ice are super effective against flying type pokemon.
Water and Grass attacks are super effective against Onix.
Phycic pkm are super effective against fighting pkm. and flying larson
Ghost and Dark attacks are super effective against Ghost type pokemon.
Steel is super effective against rock type pokemon.
ground type Pokemon are super effective against poison type Pokemon.
Rock, electric and ice are super effective against flying type pokemon.
any pokemon can beat a psychic pokemon if used well enough in battle, but the types of moves that are super effective against psychic types are bug dark ghost in generation 1 (red, blue, yellow) bug type moves were the ones super effective against psychics, while ghost type moves do not effect psychic types at all.
Water and Grass attacks are super effective against Onix.
normal type Pokemon are not super effective against any type.
Phycic pkm are super effective against fighting pkm. and flying larson
using super effective Pokemon against his' Pokemon you'll need a super effective Pokemon against his starter but you don't need to win with super effective Pokemon just stock up on potions that's what I do.
Fighting and Bug types are super effective.
Earth and water Pokemon are good against electric Pokemon.
Fire and steel types are super effective against Ice Pokemon. Electric, although super effective against water, do only normal damage to Ice Pokemon