The Monster of Kalos

After Colress goes to Kalos for alleged rumors of a Legendary Steel-Type, he finds another beast in which he is hellbent on figuring out exactly what it is, as it is Xerneas, Ylveltal, and Lysandre in an unholy freak of nature.
With research, Colress tracks down an exhausted Sycamore, asking for help.
Sycamore is not sure about this whole ordeal but goes fully on board when the monster escapes, knowing the authorities would overreact and possibly kill Lysandre, intentional or not. If Team Rocket finds him, well, who knows?
Now, he and Colress must find Lysandre before the authorities or Team Rocket does.