Mega Evolution & Other Gen 6 Crap.

[Koh]

I think they'd probably give us one for an extremely common Pokemon, like the regional rodent or regional bird or something, just so it's a FYI and try it now thing. Other than that, the only other way I'm interpreting "not through normal gameplay" is something equivalent of the Battle Frontier or Pokemon World Tournament. Get X Points, buy them yourself. These facilities weren't part of normal gameplay (optional), so that's one other source I'm seeing.