In Pokémon HeartGold, Rhydon needs to be traded while holding a Protector in order to evolve.
you cant evolve it on heartgold u can only get it in a sinnoh game
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Never it only evolves in diamond, pearl, platinum, heartgold, soulsilver, black and white.
give him a protecter and trade it!! Dur!
Rhydon is not able to evolve in FireRed.
No, Rhydon doesn't evolve in Pokémon Sapphire.
Catch it in the safari zone.
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.
Rhydon evolves when the "Protector" is held and the Pokemon is traded.
Trade your rhydon while it is holding a "protecter".