I really find it amusing that we have to speculate this tease from crude sketches; if this wasn't a Japanese movie/Nintendo or TPC related, the whole scene probably would've leaked in high quality by now!
As of right now, it really just sounds like some weird snot Pokémon with a K. Rool eye, but I can see it being a Gen 7 tease. Granted, I'd be more inclined to believe that if we've seen the Gen 6.5 game, but I don't know what it'd be a new Form/Mega of. Maybe it is Zygarde, and it's small to juxtapose the collosal Form we think was teased?