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Graveler exhibits no animal like traits, it's simply an animated boulder. HOwever, graveler assumes very mammalian like qualities. No other pokemon does this.
>dratini to dragonite
still all obviously reptilian
>larvitar to pupitar to tyranitar
larvitar and tyranitar have obvious animal characteristics, pupitar being the intermediate cocoon stage.
>golbat to crobat
both clearly batlike, though dissimilar, both would be in the same biological genus.
A rock going to a mammal is like the biggest jump you can fucking make.