Victory road if i'm thinking of the same pokemon
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In HeartGold/SoulSilver you can find a Ryhorn on Victory Road or in the Safari Zone. In the Safari Zone, it's in 'savannah' areas.
You have to find them by chance. Walk around where they are and maybe you will find a shiny ryhorn.
Ryhorn evolves into Rydon at lv. 42. it will also learn Hammer Arm after it evolves.
you have to evolve a ryhorn from the safari zone
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! :)