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In honesty, if you already have Sun and Moon there is no point getting Ultra Sun and Moon because everything is storywise same until 4th island where the Necrozma plot happens and after that the post game is RR, Legendary and UB catching, Battle Tree with new opponents and new Champion Challengers? The more I think and weight the differences between S&M and USUM, it feels like USUM is the better of the two, but if you have S&M, there is not much point getting USUM unless I care for Necrozma plot, RR, Battle facilities and rare Pokemon catching. Which I don’t.
