I get them with my emerald :D
all there is to it. Like I said, my emerald magically has a higher chance of shinies.
and yes, as I hinted at with the shauntal reference, I do my math. Something is making it do that, though what is, specifically, is not yet determined. I have hunches, and ruled out possibilities, but I'll not go in-depth.
Now answer, > or < for a nincada? :3