Use the poke radar and grass will spark yellow but if a shiny it will be blue.
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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.
From grass in Valley Windworks.
Every time you walk into the tall grass, you have about a 1/8000 chance in spotting a differently colored pokemon, a shiny pokemon. You can also use an AR to get shiny pokemon.
just run in the grass
if you dig underground you'll eventually find thunder stone then after a while you'll find shiny stone ;^)