I have found some shinies in the pokemon games but none in this gen as I can remember. ..
Had shiny raticate graveler and pidgeot (it was one of my main pokemon in gold oh I miss it. ...) on gold and silver I was lucky as a kid :-)
Shiny Gyarados in gsc and hgss
And one shiny female Archeops wih a attack beneficial nature in White 2 (that pokemon is one of my pride pokemon it's a really lucky combination and a really strong hard hitting pokemon. ) :-)
No for my failure...
Found a shiny Wooper in Diamond careful now don't let it escape throw food it stays throw one more food it stays ok let's try a ball. Throws ball it barely escapes! Please don't flee.
Thrn Wooper flees!
Nintendo ID 0318-7246-3424