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Why should I? XY and ORAS were the peak of the post-DP Pokemon visual style, and the passion that fueled that peak reflects in the Game Freak-made in-game assets. Meanwhile, Gen VII has been an all-time low for art, reflected with how nearly everything in the games as well as unusually large amounts of promotional art were outsourced, and the assets actually made by Game Freak like the Trainer battle models show a sharp decline from Gen VI.