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I only "finish" after having my fun with the battle facilities, which easily makes up 95%+ of my total playtime in every gen if you count the preparation involved. In White 2 that meant an absolute shitton of PWT battles, sometimes with monotype teams of my top 5 favorite types (Flying, Fire, Electric, Fighting, Grass). In Y that meant getting all the Maison trophies and streaking past 200 in super triples with a gimmicky team using the Water/Fire Pledges. In UM it just involved the Battle Tree for the most part, streaking past 200 in super doubles with one of my old favorites turned new favorite (A-Raichu) and getting the master ribbon for my starter. Previous gens had fun facilities too but I didn't get good at preparing for them until gen 5.