You indeed can, but you have to wait until you get all the badges, and Ryhorn will be on Victory road. I also think that if you evolve Aron twice, you'll get a Ryhorn. (Aron is in the cave in Dewford town.) Hope I helped! :)
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Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
safari zone
You can catch a rhyhorn at the safari zone west of lilycove
Rhyhorn evolves at level 42
42