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Under-baked, but to be fair it was GameFreak's first full 3D game. I imagine a lot of X and Y's development probably went more towards the new 3D engine and models for every single pokemon at the time. It's just a shame we never got an enhanced version to give Kalos itself a more complete experience. It's obvious a Pokemon Z was initially planned for 2015, because there's just no way those Zygarde forms were created just for the anime and SM.