Or it has a special gimmick move of some kind? That wouldn't be a surprise, I do actually enjoy this kind of marketing ala the Hisuian Zorua/Zoroark video was super fun to speculate about, but this is moving at warp speed. Maybe they realized the lack of news in July pissed people off. XD
Maybe it's ability to paint will have some sort of use outside of battle? Could be that we can decorate stuff with it, maybe even a t-shirt or something.
Since there are many different combinations of colours, it could also be that various Grafaiai have different combinations of colors on...whatever body part they use to paint. In the silhouette it kinda like the tail is a paintbrush (assuming that is a tail), but that would be a bit close to Smeargle, and with an Aye Aye fingerprinting seems more obvious.