Make a separate app for maintaining and curating the battle system, like an arena sim. A place where you can import any pokemon from any game in the series, and participate in a challenges or specific metas that rotate regularly
with this set up, the mainline games can start innovating and changing they gameplay without destroying VGC. Let's see something different for once, I don't want to fight everything I see with an outdated battle system about, let me interact with the world without being violent