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>new hoenn games set a few years after RSE
>drastic changes to the overworld, including sootopolis erupting, creating a large new island taking up much of the empty space in the ocean
>new island full of active lava flows and wild fire types and a new city built on top
>cave system that goes down to the ruins of old sootopolis and the cave of origin
>sea routes are now much more manageable, since it's no longer one giant block of ocean, but some sea routes going around a new island.
You'd also get to explore some of the islands to the south near where the battle tower is, sevii islands-style as well as whatever the hell is over in southeastern hoenn