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We got that kind of hints in episode 18, so I think it's very much possible. Especially with the recent promise of more old characters returning.

I must say, I was positively surprised to see one of the Vermilion Gym Trainers as Ash's WCS opponent in this episode. Who would've thought Pikachu would put those twerking lessons from Alola to use for hitchhiking? The episode 1 recreation did actually serve a purpose for Pikachu. That song...

https://bulbapedia.bulbagarden.net/wiki/JN030 Discuss the episode here.