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One thing that did annoy me about the models in X&Y is that they seem to be limited or shrunk to fit in a box. That is, there's a limit to how big they can be, but it's too small.
Wailord and Lugia are the worst examples. Wailord should be gigantic, and Lugia seems to be squashed.
Lugia has always had a huge wingspan. In the 5th gen sprites, its wings were ridiculously wide, and its head and tail seemed to stretch forward and backward pretty far as well.
Its model seems to be shrunk and boxed up though. They shrunk its wings so they'd fit into the available space, and raised its head, but now its pose looks weird.
Although, Primal Kyogre looks pretty big. Maybe they've fixed it? Tbh I'm really hoping that some aspects of X&Y were left "just good enough" to get the game out on time, and they're going to refine and improve all of the little things in ORAS.