Domain changed to archive.palanq.win . Feb 14-25 still awaits import.
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Cracked the code

No.55496257 View ViewReplyOriginalReport
The starters in Hisui are from regions that Cynthia visited.
The only major returning character in XY is Looker, who visited Unova, Alola, and Hoenn (as well as Sinnoh, his home region)

It's too soon to get Sinnoh starters again, and as we're in Kalos we'll be catching those starters in the wild. Just leaves Unova, Alola, and Hoenn