I'm trying to wrap my head around all this dimensional fuckery right now, so let's see if I have this right.
Arceus created the universe, and AZ's Floette died in the war.
In one universe, AZ doesn't create his super laser, so Mega Stones are never created. Pokemon Blue, Red, Silver, Gold, Platinum, Black, White, Black 2 and White 2 occur in this universe.
In the other universe AZ creates the weapon and Mega Stones are created. FireRed, LeafGreen, SoulSilver, HeartGold, Omega Ruby, Alpha Sapphire, X, Y, Sun, Moon, Ultra Sun and Ultra Moon occur in this universe.
Additionally both of these universes are connected to the Sky Pillar, but may also probably have their own versions of Ultra Space, the Distortion World and the Interdream World.
Do I have that right? Also Lore thread I suppose.