Has anyone summoned UB-02 yet? The Beast Ball's description has me wondering if it summons at random or if you get to pick. I haven't used mine yet since I don't want to break my chain.
From what I understand it's a bit of both. It randomly summons any available Ultra Beast, but at the Aether House you also have the option to swap out eggs. So say you use a second Beast Ball and get another Nihilego. You can trade in the Nihilego egg for either Pheromosa or Buzzwhole.
As far as I can tell, the only person to have summoned UB-02 so far is Viccupz. I saw it as I was clicking earlier. ;)
But to elaborate on that question, I do believe you get to essentially pick which egg you get. It honestly reminds me a bit of the Golden Catapult from PF1.
I just hope it isn't going to become super over-priced like tha catapult was..