Water types, leaf types, and fighting types are all supereffective against a rhydon
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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.
Water and grass type moves are 4x against Rhydon. On top of that he's also 2x weak to Fighting, ground, steel and ice. On a side note. Make sure you're using special attacks.
Rock, electric, ice, and psychic types are super effective against Crobat.
Steel is super effective against rock type pokemon.