I have a theory written about this that I'm just gonna go C/P from neoseekers
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Fazile
What about that he didn't fell of a ship or a pokemon while flying. But what if he fell out one of the hoops of Hoopa?
I think this is the most likely possibility. Theres a lot of in-game data hinting at a future episode concerning Hoopa. I think that Looker is investigating the disappearance of pokemon and land forms all throughout the world, and in the middle of his investigation, he is ambused by Hoopa and transported to this Hoenn.
Because of this, I actually think this Looker came from Black/white. We know for a fact that B/W is from the other universe, due to the lack of mega evolution. Looker was seen capturing all seven sages in B/W, yet when the sages escape in B2/W2, one of them being the new leader of plasma and committing crimes again, Looker is nowhere to be seen. If looker gets kidnapped by Hoopa and sent to OR/AS, then this explains his appearance in X/Y as well. Not only that, this might also explain the sudden appearance of two different pieces of land suddenly existing and being populated: lentimas town and aspertia city.
About the case about B/W being in the future of ORAS, thats only in THIS reality. different timelines mean different events. WIthout megastones and infinity energy making everything easier, the people might have focused around different advances, such as completing SS unova earlier than the ORAS timeline.
That being said, this point is moot in general, since Hoopa is able to warp space, and most likely time, considering that the legendaries keep all their battle themes from their respective games. So Looker couldve literally came from anywhere.
TLDR: DPP> BW> ORAS > XY. and Looker will probably have a huge importance in an upcoming Hoopa arc
also looker probably isn't scott because the Battle Frontier is already in development, which means Looker had no part in it
MOD EDIT: No double posting, please.