>>38610241It looks to me more so like Graveler is sort of layered, the lower two arms tend to be tucked in and they appear thicker than the arms, I think the logical next step would be a Pokemon that would make this layering more evident and would have the small protrusions that Geodude and Graveler have develop into full on horns/tusks/spines, meanwhile its arms would appear considerably more bulky and it essentially have legs that are just the feet.
