I could see them adding the Emerald Battle Frontier to the post-game. There are also a few islands around the frontier according to the map in RSE so they could easily give access to Pokemon from Gens 1-4 by adding Sevii-ish islands located in Hoenn.
This just reminds me of the rumor that floated around pre-BW that said that you could fly to Hoenn from the Mistralton Airfield.
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