Bguy7
The Dragon Lord
I saw a theory on it once. Apparently the Looker in ORAS is quite visibly a Faller by his lack of memory for who he is and the time stamp when he enters the battle resort being similar to when Anabel landed in Alola. However, the Looker we see in SM has a key thing about him that is inconsistent, and that's the fact that he is not covered in Ultra Wormhole Energy, proven by how he isn't used as bait for the UBs. The theory states that the only way this could possibly work is if two Lookers were in the same universe together at the same time.
There is one major problem with that theory. When you find Looker in Omega Ruby and Alpha Sapphire, he has no clue of his past, except for the Audinite Mega Stone. If this were the Looker from the original universe, then there's no way he'd be able to have a Mega Stone in his possession, as Mega Stones don't exist in the original timeline. It is quite literally the defining characteristic that separates the two universes. Now I suppose you could argue that perhaps that was a Looker from yet another universe with Mega Evolution, but that would be baseless.