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Instead of polished rehashes each gen, the second more polished edition would also be a sequel OR a prequel to the previous setting.
Think it as bw2 but with even more 2.
What would have xy2 been like? How about sun and moon prequel of sorts? New or "older" old areas to explore with small stories or npc trainers that tie into the other game. It needs to be nothing major just small touches like Yongster Kalvin turning into Gentelman Kalvin and having a fully evolved version of his mons with him mentioning how his old ace that he used had passed recently.
The reason why usum got hopes of many people up was because of the theories about alternate timeline but it turned out to be nothing big. But what if the definitive third game WAS a major alternate timeline? The image I used for this thread is an early version of N from BW. Pretty clear that the intent was for him to be a zoroark putting up a façade to look like a human. Even if areas do not have large changes, the plot could have them and in turn use the old areas for new events making it still an "upgrade" and not a different look through the same story plot.