Well i play Pokemon Crystal so i believe Rhydon is in Kanto on victory road. I hope this helped!
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Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.
Rhydon, in Pokemon FR/LG, does not evolve.
Rhydon
..........level rhyhorn to 42.....get a rhyhorn from safari and evolve it to rhydon
When looking at the item, it does say "a Pokemon loves this item". It is a hint to give a Pokemon that item. Well that Pokemon is a rhydon. Give a rhydon that item to hold. Trade it and see what happens...