I don't know anything about Pokemon but I play the opposite versions when my gf buys them so she can get everything or something? I don't know. Buuut I have ridiculous shiny luck. She spends hours hunting for them but I just kind of run into them, no matter the version. Recently I asked what a shiny ponyta looked like, and then I looked at the screen and there it was, shiny ponyta.
So I don't really like the games but am being used as a sort of shiny/version exclusive content supplier. I do really like my shiny gyarados though, he's my favorite.