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Okay so before the last arc's finale the gang finally arrives at Paldea, they precisely get to some beach close to an island, and that island is later revealed to be close to Levincia. They also were traveling above other lands before that and we even got Dot's mother there, she was just around and Friede could pick her up with Charizard without even stopping the Brave Asagi.
That means those episodes took place around here, so Dot's family must be from Kalos, right? So
>Friede, Orio and Roy are kantonian
>Cap and Liko are paldean
>Murdock and Dot are kalosian
Only ones with unknown origin would be Landau and Molly. Sure Landau was first seen in Kanto with Friede but he also has been in Paldea enough for him to be a famous hero and have a bromance with a dolphin so who the fuck knows where he's from