Rhydon evolves by trade, not level.
Attach the Protector to it, trade it, and viola! Rhypherior at your command!
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Rhyhorn evolves into Rhydon at Level 42. Rhydon can then evolve by attaching a Protector to it and then trading it.
Basically Rhydon doesn't evolve on a certain level. You need to have Rhydon hold a Protector and Trade it, with a another person.
Rhydon at level 42. Rhydon evolves into Rhyperior when it is trading holding a Protector.
Rhyhorn evolves into Rhydon at level 42, then Rhydon can evolve into Rhyperior, while holding a Protector and traded.
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.