Board Thread:Speculation, Theories, and Rumors/@comment-30806525-20170206162923/@comment-477304-20170329175704

From what I've heard, that line was a translation error and was meant to follow on from something Sonic said prior.

Not all of Eggman's robots are powered by animals; some are powered by seeds, Rings, Light Cores, Chaos Orbs, or other non-defined power sources. I could be wrong, but I don't think Metal Sonic has ever been labeled as a Badnik either.