PokéBase - Pokémon Q&A
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If you want a specific move that Geodude can learn by level up, then you can chain breed rock slide from Sudowoodo onto Geodude and then onto Onix.

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The only Pokémon who can breed Rock Slide onto Onix in Generation 2 are Sudowoodo (it learns the move through Level-up and is in the same Egg Group as Onix) and Ditto (because it can breed with "almost" any Pokémon).

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I don't think Ditto can breed rock slide onto Onix.