Catch it in the safari zone.
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Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Rhydon
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
Well i play Pokemon Crystal so i believe Rhydon is in Kanto on victory road. I hope this helped!