You can get it in the Safari Zone. You have to go past the mud slide to the far left to get into the correct area.
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Rhyhorn is only available in the Safari Zone. It can be located usually at the Central Area.
Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
You have to find them by chance. Walk around where they are and maybe you will find a shiny ryhorn.
Rhyhorn is the Rhino Pokemon, I think.
In the game Pokemon ruby destiny