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.
you have to trade from another game
Do you have a high level rhydon, or just thinking of what rhydon evlolution is? Trying to evolve it? Hm... The answer is right here! Right now, and in the right place. If you have a protecter... You might be just lucky if you have a friend to trade the rhydon with the protecter. Hey! When you trade a rhydon with a protecter it's possible to trade pokemon, and the other user gets the different pokemon. Good luck!
victory road, the 1st area you have to trade from another game
Rhydon might be Pokemon #112, but he was drawn up before any other Pokemon, even his pre-evolution Rhyhorn. Despite being a ground type, Rhydon can be taught water-type moves such as Rain Dance, Whirlpool, and Aqua Tail. According to interviews with Ken Sugimori, Rhydon's index number in the game code is 001 in Generation I, precisely because he was the first one coded in. There are also early sketches of Rhydon from Capsule Monsters, the conceptual predecessor to Pokémon. Rhydon was inspired by many different dinosaurs. Its name can roughly be translated to Rock Lord. According to the game, Rhydon's drill-horn is capable of crushing un-cut diamonds, and it can knock down buildings with a single strike of its tail.
Rhydon might be Pokemon #112, but he was drawn up before any other Pokemon, even his pre-evolution Rhyhorn. Despite being a ground type, Rhydon can be taught water-type moves such as Rain Dance, Whirlpool, and Aqua Tail. According to interviews with Ken Sugimori, Rhydon's index number in the game code is 001 in Generation I, precisely because he was the first one coded in. There are also early sketches of Rhydon from Capsule Monsters, the conceptual predecessor to Pokémon. Rhydon was inspired by many different dinosaurs. Its name can roughly be translated to Rock Lord. According to the game, Rhydon's drill-horn is capable of crushing un-cut diamonds, and it can knock down buildings with a single strike of its tail.
30 something and it you cant find it in that game
unlock all other trophies in a game
you give it to a rhydon to hold and then trade it to a different game. it will evolve into a rhyperior.
Rhyhorn evolves into Rhydon at level 42.
I don't think you can find rhydon itself, I think you have to find a ryhorn, which can be found at victory road, about level 45, or somewhere around there (forgot what level exactly) and it evolves into rhydon at level 49, but, (from another answer I heard (not wanting to take credit for it)) wait till it gets to level 55 first so give it everstone to stop it evolving because it learns earthquake at 55 where rhydon learns it a 65. Earthquake is the best ground move in the game.
The easiest game i would say is Hot Corn its an easy 2500 coinz on Meez.com
you cant evolve it on heartgold u can only get it in a sinnoh game