Yes it is possible, but it 100 % pure luck.
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No, simply save your game right before you choose which starter pokemon you want. But be warned you can spend several thousand restarts searching for a shiny starter..
there is no shiny stone in Pokemon ruby it's only in sinnoh
Luck. You have a 1 in 8,192 chance of your starter Pokemon to be Shiny.
Random luck. The Pokemon must be wild. You cannot change a Pokemon you already have into a Shiny.
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