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...What if Cyrus is Guzma after travelling in Time and Space sometime during the game of Sun & Moon. What if he ends up expanding his idea of Team Skull to something more grand such as Team Galactic, in order to harness the power of Time and Space, in order to get back to the past.
What if Looker's true intentions and purpose for originally appearing in Sinnoh was to track down Guzma/Cyrus and stop him.
Looker does look like the character of the Doctor in Doctor Who the time Platinum was released. Doesn't he? If you aren't aware, the Doctor is a time traveller who goes from various places in space and time and ends up stopping bad stuff from happening.