Yes, as long as one is male and one is female
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.
first get a rhydon if you want of height level max go to route 228 when you got it trade it with the protector and rhydon evoloves the trade it back. NOTE: when rhydon evoloves he dosent have protector any more
Rhydon evolves into, ---------{rypherior}
Trade a Rhydon while it's holding a Protector. You can find a Protector on Route 227.
Rhydon evolves when the "Protector" is held and the Pokemon is traded.
Trade it with the Protector on it
At M.T Stark
You have to get the Moon stone.
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.
you can find one in victory road.
You cannot find rhypierier on Pokemon Platinum. You have to trade rhydon while it's holding the protector.
The evolved form of Rhyhorn is Rhydon