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I was just thinking... does anyone know if the amount of 1-4 gen Pokemon is equal to the amount of 5th gen Pokemon they left out? By that I also mean those we cannot use, such as Victini. And also the ones with models in the game, yet are still unplayable (Starmie and Chinchou come to mind). Maybe they added all the 5th gen Pokemon first, saw that it took much too long to do that, and decided to half-hazardly replace some of the 5th gen ones they already had with the 1-4 gen ones they needed.
Pic semi-related