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Going from 2D to 3D, and trying to cater to casuals.
That said, XY still managed to do a-lot of good. It had a fantastic multiplayer experience, improved training mechanics, the best Regional Dex to date, character customization to personalize the game, Megas giving old Pokemon a new lease on life, etc. It's a problematic game, but it's got a-lot of redeeming qualities.