There are 3 ways
1. In Route 14, get someones number and after a while, they will call you and say they have something for you. Go there and get the Shiny Stone
2. Pokethlon Dome (3,000 points)
3. Bug Catching Contest.
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pogi
you find the sihny ston in mewtoo's cave
I traded one to my game. They are common is Pokemon Diamond and Pearl, so if you get one there you can trade it to your Soul Silver. If you don't have one of these versions, you can get a Shiny Stone in the Pokeathon Dome from 3,000 BP.
To get a shiny stone you can you to the pokeathlon dome and sometimes you can get them at the prize exchange shop for 3000 points.
No such thing. Sent me a message on what you mean. Do you mean a shiny leaf?