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The fact that Gamefreak actually decided to finally do something new that was actually worth something and fits with the series by making the wild area, being able to actually see pokemon instead of having to run into grass and see the same one or two pokemon almost every single time, the hidden pokemon, the candies that cuts down on grind, the dynamax battles where I can help lower level players or just make use of my lvl 100 space dragon, the good character designs, some of the music (but barely any), trainer customization that still needs to catch up but is mostly okay, some of the characters themselves like marnie and hop, zacian and eternatus, being able to level up pokemon I always wanted to use in the past but couldn't because I was too attached to every member of my then full team and didn't want to box them so now I can use these in raid battles instead of even touching online battles with a ten foot pole and probably getting my ass kicked by competitive level players, actual 3d graphics that at least look decent even if it looks like shit in other places, egg hatching probably being less tedious than it was in the past because I can harvest berries and find watts to pass the time spent waiting for the egg to hatch instead of doing whatever people did in the past like riding their bike in a circle, shiny chances being lowered so now I can actually catch one in my lifetime, some of the fun and goofy gym challenges in the beginning of the game, melony, and overall a worse but finally much less inconvenient pokemon game that I can actually say I like and had fun with even if people everywhere like to screech about it to this day.
that's all I can think off the top of my head but yeah, fun game