Basically Rhydon doesn't evolve on a certain level.
You need to have Rhydon hold a Protector and Trade it, with a another person.
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Rhydon, in Pokemon FR/LG, does not evolve.
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
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.
Rhyhorn evolves into Rhydon at level 42, then Rhydon can evolve into Rhyperior, while holding a Protector and traded.
lv55 rhydon evolves rhyhornlv20 rhydon lv35 rhyperoir lv55