In snowpoint city, there's a cave there with the shiny stone, it's difficult to find though...
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You can find a Shiny Stone in route 6.
To find a shiny stone in platinum you have to dig in the underground tunnel.
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 get a Shiny Stone on Monday for 3000.
if you dig underground you'll eventually find thunder stone then after a while you'll find shiny stone ;^)