So, here we go. I found a Shiny Rockruff in the Catching Challenge. I can't begin to express how pissed I am because you can't keep it, and before you ask, I don't have it anymore because I turned in the challenge unknowingly that I'd lose it so I don't have any proof I found it other then my word, which I know is ****. For those of you who want to know what a Rockruff looks like shiny, here's a video which I believe it and all the shinies are in, which was leaked via datamine (unable to watch it to confirm but this *should* be it.):
This find obviously depresses me because I can't keep it, but I guess that's the way it goes. I hope I'll find another one in the full game.