Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
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Rhydon, in Pokemon FR/LG, does not evolve.
Basically Rhydon doesn't evolve on a certain level. You need to have Rhydon hold a Protector and Trade it, with a another person.
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
Trade it with the Protector on it
Rhyhorn evolves into Rhydon at level 42, then Rhydon can evolve into Rhyperior, while holding a Protector and traded.