You have to find them by chance. Walk around where they are and maybe you will find a shiny ryhorn.
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If your legendary Pokemon run away in Shiny Gold, there is no way of retrieving them again.
yes
Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
Rhyhorn is the Rhino Pokemon, I think.
The Shiny Stone does not exist in Pokemon Gold, Silver and Crystal it was added when Diamond and Pearl came out and if you're referring to Pokemon HeartGold, the Shiny Stone can be found at the National Park and can be won if you come in 1st place in the Bug Catching Contest.