Rhyhorn horn has many weakness's. water times 4, grass times 4, ice fighting, ground, and steel are super effective.
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Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
Rhyhorn is the Rhino Pokemon, I think.
You can catch a rhyhorn at the safari zone west of lilycove
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
safari zone