There is no actual area to get shiny pokemon. They just appear. I was lucky enough to get a shiny BIDOOF at route 205 at lv 10.
HOPE I HELPED
I think a egg with a shiny Pokemon in it is a different color
To get a shiny Pokemon try using the poke radar
You can find shiny Pokemon randomly through out the game.
the code is 77777899992220
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Roselia
No.
You have to use cheat code.
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.
Pokesav
You can't
you don't need a ar code to catch and keep shiny Pokemon in Pokemon pearl all you need to do is find the shiny Pokemon you want and catch it and unless you release it you keep it.