Arcanine is a Fire type Pokemon, so Water, Rock, and Ground attacks are super effective (they do 2X damage).
Arcanine is resistant (half damage) to Bug, Steel, Fire, Grass, Ice, and Fairy attacks, so those aren't good strategies.
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Ghost & Flying. I believe that's it! Not dark or bug because although they're super-effective against Psychic, they are not-effective against Fighting. And not Psychic, because though it's super-effective against Fighting, it's not-effective against Psychic.
Water and Grass attacks are super effective against Onix.
Rock, electric, ice, and psychic types are super effective against Crobat.
Steel is super effective against rock type pokemon.
psychic pokemons and attacks are super effective