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I'd rather not pick on XY because "muh third version" and whatnot. So,
>no old-school gen 3 outfits easter egg in the gen that introduced trainer customization
>No online contests
>No gym rematches
>Black City/White Forest don't connect via internet, neither does entralink
>The C-Gear
>The Pokemon Musicals
>Castelia City is rather lackluster and limited in exploration
>You can only use dive in one area, even in BW2
>The Canalve library didn't have informative books about legendaries/hidden routes/rare berry locations/etc. that you could read and later go to that area yourself
>North Sinnoh only has one route (as in pathway) that leads to one city