Catch Rhyhorn in the Safari Zone, then evolve him by training.
No, Rhydon doesn't evolve in Pokémon Sapphire.
Rhydon does not learn Dig by naturally leveling up. It learns Dig by using the TM28 in Pokemon X, Y, Alpha Sapphire, and Omega Ruby.
The easiest way to get a Rhydon is by Pokemon XD Gale of Darkness nd in there is a Shadow Rhydon in the game and after purifying it you can trade it to Ruby, Sapphire, FireRed, LeafGreen or Emerald and then if you want you can migrate it to Diamond, Pearl or Platinum.
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Trade your rhydon while it is holding a "protecter".
Rhydon evolves when the "Protector" is held and the Pokemon is traded.
Rhydon
You can get rhydon by doing the Pokemon rangers shadows of alima *2* "Get The Red Gem!" quest hope this helps!
Rhydon is not able to evolve in FireRed.
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
Protector when attached to Rhydon and traded evolves Rhydon into Rhyperior.