There are 2. The first is on Iron Island and the second you get on Rt 228 at the end of one of the narrow bicycle bridges.
There is a shiny stone at the end of Iron Island.
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.
Shiny stone is used to evolve Roselia to Roserade Togetic to Togekiss
in iron island
Shiny Stone
Iron Island.
You can find shiny stones on route 228 and Iron island
End of iron island
Use a shiny stone!
by a shiny stone in lake valor
End of Iron Island
In Iron Island. before entering Registeel cave you found a poke ball with the shiny stone. you can get a shiny stone in route 228 too.