>>33737241The way it's been presented is a little suspect. Much like type: null, it's the main mon of a minor antagonist that you fight early on. Type: null eventually evolves to better stand up to your growing team, like a rival's starter.
There also hasn't been such a blatantly cute UB so far. I expect to get spammed with images of guzzlord and celesteela, but they were not designed to be cute. This thing was.
Then there's other mons that have hinted at future stuff via the official website. Grubbin was said to burrow near power plants, and everyone correctly predicted it to become bug/electric. Salandit had some fluff about the females and pheromones, and we got salazzle. The first thing on the official website says this about UB Adhesion:
"UB Adhesive displays many emotions, and it’s said to be able to understand human speech if it spends enough time together with them."
All that could be a red herring and be single stage. It just seems a bit suspicious.