Trade it with the Protector on it
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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.
you give rhydon the protector then you trade him to a friend then get the friend to trade him back and you have your self a rhyperior
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Give it to a Rhydon, and trade it. It should evolve into Rhyperior.