Metal KnucklesRace- Robot Echidna (Advance Badnik)
First Apperance- Sonic R (Saturn)- 1996
Creator- Yuji Uekawa (?)
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Bio-Metal Knuckles was a Robot Counterpart to Knuckles, in much the same was as Metal Sonic is counterpart to Sonic. He was created by Dr Robotnik and has only appeared in Sonic R.