Just keep killing them in a row and sometime it will apear.
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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.
You cant find a shiny regice unless you have action replay
Iron Island.
You can find shiny stones on route 228 and Iron island
Well, your chances of finding a wild shiny pokemon are 1 in 8192 sooo to answer your question... a VERY VERY long time.