In order to get Rhydon to evolve, you must link trade it while it is holding the protector item.
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Rhydon evolves into... RHYPERIOR!!
Rhyhorn evolves into Rhydon at Level 42. Rhydon can then evolve by attaching a Protector to it and then trading it.
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Basically Rhydon doesn't evolve on a certain level. You need to have Rhydon hold a Protector and Trade it, with a another person.