PokéBase - Pokémon Q&A
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Breeding with Larvitar, Pupitar or Tyranitar that knows Rock Slide (If the Lavitar/Pupitar/Tyranitar is male while the Rhyhorn/Rhydon is female).
Source: Bulbapedia

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The Larvitar family isn't the only compatible father that learns rock slide. Rhyhorn can also inherit rock slide from stuff like Mankey or Smeargle.