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The design docs have a part where they're discussing locations for the cast to visit, with the idea they shouldn't go to every region in order to limit overlap with the last ash series and the only locked in regions at the time is paldea and galar. But next they mention kalos because of "ikkaku" (which seems to be the codename for z-a) but another guy says they should go to kitakami because of "su" and I can't figure out what su is unless it's a shortened version of the legends arceus codename of hayabusa.
I guess the interesting part is between this and the conversation about what exceed does it seems like at some point in development there was supposed to be a plotline already introduced by now that would have given a reason to travel to kalos. The exceed part specifically was about them producing mega rings to build up to going to kalos.
