You have to go to iron island to get the shiny stone.You can you use it on Roselia (which will evolve it to Roserade)or you could use it on Togetic which will get it to Togekiss.
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To find a shiny stone in platinum you have to dig in the underground tunnel.
There is a shiny stone at the end of Iron Island.
With a Shiny Stone
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.
give it a shiny stone