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The new style sometimes fudges spacial bondaries and anatomy in order to make the design look simplistic and marketable, and that just leads to some awful off model shit once the creature is in motion. Sometimes these designs just dont translate well to 3d, something the first gen did weirdly well despite coming from a pixel game.
In an effort to make happiny look perfectly round, they do not give enough space for its egg. And then the anime cant decide if its a marking or an actual object.