You can find 2.
Route 6, and Dragonspiral Tower.
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No they programmed the game so you can't catch shiny victini, reshiram, and zekrom. All other pokemon can be found shiny.
The chance of a Pokemon received from an in-game trade being shiny is the same as the chance of capturing a shiny Pokemon in the wild.
You have to use a shiny stone on Roselia to evolve it. Unfortunately, you can't get shiny stones in sapphire, ruby, or emerald. You have to trade a Pokemon from diamond, platinum, or pearl into your game that is holding a shiny stone in order to get it. I know it sucks, but that's the only way I can think of to get it.
A shiny Riolu is like any other shiny Pokemon in the game, for every Pokemon that you encounter, there is a 1 in 8192 chance that it will be shiny.
if trade someone for a shiny but not in the game (unless you us the action replay for shiny wild Pokemon) (with that code every wild Pokemon will be shiny).