This transformation exists primarily or exclusively within the Pre-Super Genesis Wave continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Powers and skills
Chaos Knuckles is a transformation in the comic series and its spin-offs published by Sonic the Hedgehog Archie Comics. It was a natural evolution achieved by Knuckles the Echidna in the universe of Dark Mobius.
Chaos Knuckles' early history was most likely largely the same as his
Mobius Prime counterpart's. The point of divergence was when Knuckles began thinking differently of the events after blocking a shot at Dimitri in this form. Unlike his  Prime Zone self, this version of Knuckles never returned to his normal form, instead retaining all his powers. Using this strength, he eventually defeated Dr. Eggman, but ended up becoming the villainous Dark Enerjak. Chaos Knuckles later lost his powers when  Jani-Ca drained them from him with the Sword of Acorns.
Alf Layla wa-Layla | Baker | Burning Blaze | Chaos' forms ( Chaos 1, Chaos 2, Chaos 4, Chaos 6, Perfect Chaos) | Color Power | Dark Queen | Dark Shadow | Darkspine Sonic | Devil Doom | Excalibur | Excalibur Sonic | Finalhazard | Gaia Colossus | Hero Shadow | Hyper Mode | Hyper Knuckles | Hyper Sonic | Master Core: ABIS | Mephiles' monstrous form | Nega-Mother Wisp | Neo Metal Sonic ( Metal Madness, Metal Overlord) | Perfect Dark Gaia | Roboticization | Sonic the Werehog | Super transformation ( Classic Super Knuckles, Classic Super Sonic, Classic Super Tails, Flicky's Super State, Mecha Sonic's Super State, Pir'Oth Ix's Super State, Super Knuckles, Super Mighty, Super Ray, Super Shadow, Super Silver, Super Sonic, Super Tails, Ultimate Gemerl) | Ultimate Emerl | Void's transformation
Sonic the Comic Perfect Chaos | Super Sonic ( Mirror Zone)
Adventures of Sonic the Hedgehog Roboticization | Super Robotnik | Supreme High Robotnik
Archie Comics Pre-SGW
Chaos' forms ( Chaos 6, Perfect Chaos) | Chaos Knuckles ( Dark Mobius, Light Mobius) | Chaos Shadow | Crystalline Magic ( Crystal Golem) | Enerjak ( Dark Enerjak) | Finalhazard | Metal Overlord | Perfect Tikhaos | Roboticization ( Blaze Woman, Charmy Man, Espio Man, Knuckles Man, Mecha Sally, Mecha Sonic, Rose Woman, Rouge Woman, Shadow Man, Silver Man, Tails Man, Vector Man) | Super transformation ( Hyper Knuckles, Hyper Tails, Master Mogul, Super A.D.A.M., Super Armor Mega Man, Super Scourge, Super Shadow, Super Silver, Super Sonic ( Dark Mobius, In Another Time, In Another Place), Turbo Tails, Ugly Naugus, Ultra Sonic ( Eco Sonic, Polar Sonic, Solar Sonic)) | Titan Metal Sonic | Titan Tails | Werehog
Burning Blaze | Chaos Shadow | Crystalmancy ( Crystal Omega, Crystal Sonic) | Devil Doom | Monster Form | Neo Metal Sonic ( Metal Overlord) | Overclocked Nicole | Perfect Chaos | Perfect Dark Gaia | Roboticization ( Blaze Woman, Charmy Man, Espio Man, Knuckles Man, M'egga Man, Rose Woman, Rouge Woman, Shadow Man, Silver Man, Sonic Man, Tails Man, Vector Man) | Sonic the Werehog | Super transformation ( Super Armor Mega Man, Super Shadow, Super Silver, Super Sonic)
Sonic X Chaos' forms ( Chaos 2, Chaos 4, Chaos 6, Chaosbot, Perfect Chaos) | Cosmo's transformation | Dark Sonic | Final Lizard | Final Mova | Serpenter | Super Shadow | Super Sonic
Chaos Dingo | Regeneration | Roboticization ( SatAM, Sonic Underground)