Single post in Special Pokemon

I'm not saying it would be thousands upon thousands of pokemon. For example the pink pokemon, in the anime it's about 15 pokemon that get a colour change. And then lucky could just be a chosen handful of pokemon. For example, in one event it could be a chance out of 4 pokemon. Then next time it's done, it could be 4 different pokemon. It would make them incredibly rare and valuable - available to pretty much anyone. I would never expect all 1000+ pokemon to get a brand new custom sprite - not at all :D Oh it just got immediately rejected...okay then...