>>13791205I google'd it, but yeah I don't know where they get this stuff.
I've also found hi-res of all 6th gen Pokemon, I've dumped them all before a few times, I'm going to dump again soon with the new artwork soon. Just gotta make them all transparent and other such things.
What bugs me is that I just realized there's hi-res art of that quality for the older Pokemon, but none of it's been released besides ones like Blaziken and Mewtwo that have Mega Evolutions.
Hopefully someday someone somehow gets hold of all hi-res artwork.