How to Evolve Rhydon Into Rhyperior. First of all, if you haven’t already evolved your Rhyhorn into Rhydon, you’ll need to do that. Rhyhorn evolves into Rhydon starting at level 42.

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All you’ll need to do to evolve Rhyhorn into Rhydon is simple raise it to level 42, where the evolution animation will automatically trigger. Image Source: The Pokemon Company via Twinfinite.