I have a shiny Rapidash and Crobat sitting on my Gold version. Then there's a shiny Crobat that a friend gave to me back in the GBA days that's sitting somewhere in my SS, as well as an SR'd shiny Ho-oh on my HG. :3
I've yet to find one on Black though. I hope I find one soon, I've had my copy since the day it came out over here. xD