Wait a second.

In X/Y, Lysandre imprisons AZ and takes his key to use the weapon to destroy all humanity except for Team Flare.

If we assume the Lysandre in US/UM succeeded in his goal, this means AZ never reunited with his Floette.

From the unused data in Sun/Moon, we know Eternal Flower Floette is still programmed in the game. Does this mean the player encounters Floette? Will the ultimate weapon be a goal for Rainbow Rocket?