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Possibly. They have time-traveled before so it's certainly not out of the question. They could make a whole movie out of that idea, now that I think about it. Though I still wouldn't get my hopes up. They could easily just make a single episode where Ash and co. look at an ancient Hisui...

It's a Game Freak game so I'd be legitimately shocked if it didn't get some form of cross-promotion. I'd say for these games in particular, though, a standalone miniseries would make the most sense.