No, Rhydon doesn't evolve in Pokémon Sapphire.
Catch Rhyhorn in the Safari Zone, then evolve him by training.
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Rhydon is not able to evolve in FireRed.
You cannot get the protector to evolve Rhydon in Pokemon Red version, because Rhydon's ability to evolve with a protector into Rypherior is only available in the latest versions: Pokemon Diamond, Pearl, and Platinum. It is impossible to even get a protector in Pokemon Red version, let alone evolve Rhydon.
to evolve rhydon you need a protector. I think you can get one on stark mountain. Then you have to give it to Rhydon and trade with a friend.
Trade your rhydon while it is holding a "protecter".
Rhydon evolves when the "Protector" is held and the Pokemon is traded.
no you can evolve rhydon
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