Random luck.
The Pokemon must be wild. You cannot change a Pokemon you already have into a Shiny.
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there is no shiny stone in Pokemon ruby it's only in sinnoh
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misdreavus
It is posable to get a shiny Latios in Pokemon Ruby but the chances of getting it is even more rare then just getting a shinny pokemon. If you are able to get one you are one lucky person
Yes it is possible, but it 100 % pure luck.