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Unlike older Pokemon, these are designed from the start to move in a 3D space. Many of them have non-obvious features (Bruxish's lure, Drampa's claws) that take advantage of not needing to look good in a still (or even looping) sprite.
Also, Ohmori is not a great artist and kind sucks at proportions/prspecctive. I'd honestly prefer if they just released posed HQ versions of the in-game models rather than 2D art next gen if it's going to be stuff like pic related.