>>43517707Because Graveler takes on the Reptilian features of Machoke and Machoke takes on the 4 arms of Graveler when they evolve.
It seems like it was a concept they wanted for specific Pokemon to be traded for design wise and then probably dropped it midway through when creating Alakazam and Gengar, and realizing that specific Pokemon trading was a bit restrictive and only brought it back up with Karrablast and Accelgor years later.
