Honestly i do not know where to find the shiny stone but i am looking for it too. However i do know that it is used to evolve togepis evolved form ( i don not know the name of it ) into the next evolved form.
Up your behind
You find them depending on your pokemon's nature see more on serebii.net
To find a shiny stone you can trade a pokemon thats holding the shiny stone or maybe someone in your pokemon game will give you one. If you use a Shiny Stone on Minnico it will evolve into Cinnico
you can get a shiny Eevee on Pokemon leafgreen but its rare. its about a 1/5000 to get it
You can find a Shiny Stone at Route 228 and also at Iron Island
you can get a shiny stone in iron island when your exiting iron island go to you right
End of iron island
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.
To find a shiny stone you can trade a pokemon thats holding the shiny stone or maybe someone in your pokemon game will give you one. If you use a Shiny Stone on Minnico it will evolve into Cinnico
In snowpoint city, there's a cave there with the shiny stone, it's difficult to find though...
if you dig underground you'll eventually find thunder stone then after a while you'll find shiny stone ;^)
It Is a Shiny Gyardos if you want it red
you can get a shiny Eevee on Pokemon leafgreen but its rare. its about a 1/5000 to get it
You can find a Shiny Stone at Route 228 and also at Iron Island
you cant find shiny stone in Sapphire only in pearl nooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo you cant nooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo you cant
You have to be VEEEEEEERY patient - the chance of a Pokemon being shiny is 1/8192