Rhyhorn will evolve at Level 42.
At level 42 in Rhydon.
Rhyhorn evolves at level 42.
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..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
Rhyhorn is one of the Pokemon that take a while to evolve. You have to level it up to level 42 in order for it to evolve into Rhydon. If you give Rhydon a protector and trade him, then he evolves into Rhyperior.
level 42 or 44
Rhyhorn evolves into Rhydon at level 42, then Rhydon can evolve into Rhyperior, while holding a Protector and traded.