You can get a Shiny Stone by winning first place in Bug-Catching Contest. Winning first place could land you with any stone.
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You can find a Shiny Stone in Route 228 in Pokemon Diamond and Pearl. In Pokemon Platinum, you can also find a Shiny Stone on Iron Island.
You can find a Shiny Stone in route 6.
if you dig underground you'll eventually find thunder stone then after a while you'll find shiny stone ;^)
You can find shiny stones on route 228 and Iron island
Basically you can't, but you can get shiny's with the poke radar if you head to the shiny sections of grass. You can also get shinies in the wild if you reste the game until you find one!