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Welp Joe lost it
>BW
4 more cities, many more routes, caves and areas - basically 25-30% of the region, championship (you didnt become champion pre post game in BW), many more old mons to catch, Looker mission, legends.
>BW2
4 more cities (different ones than in BW post game). several routes, caves and areas, more strong bosses to battle (Alder, N, Cynthia, Colress, Hugh), PWT with ALL old champions and ALL old gym leaders. White Threehollow/Black Tower challenge, movies, Join Avenue, funfest missions, more Pokemon to catch, legends, lost XTranceiver mission
But hey USUM has legends. RR story and few extra patches of grass on Poni Island. Thats better