Are you some of you all just born stupid.
Beginning of Video 2, "these are not all the regular sprites but we have most of them" or basically words of that phrasing are seen on screen and read off. I get people wanna shit on Pokemon for SOMETHING about SM, I get it, but do your own fact checking instead of some bitch ass poketuber that couldn't do his own and had to say "ENTIRE" to get even more people drawn in being your source.
Even then a few leaks from before, which have MOSTLY been right so unless they were red herrings by the leaker, have claimed 85 new pokemon with 6 UBs, there being 10 UBs, at least 20 alolan pokemon (which if there are more is a red herring and hope to god is)
Though it does make sense Zygarde is the Trio Master or Quintet master of Yveltal, Xerneas, Solgaleo and Lunala because of the cores things, because Zygarde is meant to keep peace with the eco-system, and because each on represents a different aspect of existence: Death, Life, Matter and the Soul. While it sucks Lunala and Solgaleo didn't get like Ghost Aura and Steel Aura in order to make more sense to this idea, I get it's because while they do also fall under Zygarde's jurisdiction, TPCi wanted them to stand out a bit more and have a tweaked background, gimmick, etc than their XY equivalents.