Chaos
Okay, you fought this guy a bunch of times with Sonic and others to test out your skills while he was in six of his different forms, only to battle his most powerful, destructive form Perfect Chaos with Super Sonic. Respect one of Dr.Robotnik's greatest creations along with Metal Sonic known as, CHAOS!!!!! 😎 😎
Eggman, found out about him.
He is the main antagonist in the video game Sonic Adventure for the Sega Dreamcast. Chaos is the first main antagonist of a Sonic game that's not Doctor Eggman. This eventually became common in the 3D games, with Eggman's role as the main villain being replaced by other villains. Chaos is an immortal, ageless god-like creature (referred to as the "God of Destruction" by Eggman) that seems composed almost entirely of water (save for his brain, green glowing eyes, and, in some later forms, bones) but is also said to be concentrated Chaos Emerald energy (in Sonic X, Doctor Eggman implies that it is composed of "Chaos energy in a liquid state"😉, however it has been revealed that Chaos is a Chao that came into contact with the Chaos Emeralds. It was trapped inside the Master Emerald for thousands of years before being released by Dr. Eggman in a bid to conquer the world. It was also the original guardian of the Chaos Emeralds, Chao, and the Master Emerald. In Sonic Adventure it absorbed the negative energy of the Chaos Emeralds to attain its final and strongest form.
Past
Chaos is a water god-like creature that uses its power to guarantee clear water around the altar of the Master Emerald, and to protect its fellow Chao. However, the leader of the Echidna tribe, Pachacamac, tried to steal the Emeralds so he can use them against his enemies. His warriors storm the shrine where the Emeralds are kept, harming many Chao in the process. Chaos, in a fit of rage at seeing the Echidna tribe hurting the Chao, absorbs the negative power of the Chaos Emeralds and transforms into "Perfect Chaos". The resulting floods destroy the Echidna civilization. Pachacamac's daughter, Tikal, seals both Chaos and herself into the Master Emerald. It is from this point in history that the Emeralds are called "Chaos Emeralds".
Sonic Adventure
In Sonic Adventure, Dr. Eggman, having read ancient tablets describing the fall of the Echidnas and Chaos, releases it by shattering the Master Emerald in order to make the creature help him in his quest for world domination. Chaos swears to follow Dr. Eggman as it knows that it can get the Chaos Emeralds back for it.
Eventually, Eggman's plans, as always, fall through at the hands of Sonic the Hedgehog and his friends. Chaos abandons him and collects the Emeralds itself, absorbing the negative powers of them and transforming into Perfect Chaos again. This leads to the city Station Square's destruction as a result of the flooding. Having only taken the negative energy, Chaos discards the remnants of the Chaos Emeralds. This proves to be the means to its downfall as Sonic absorbs the positive energies of the Emeralds and transforms into Super Sonic, eventually defeating Perfect Chaos and in the process ridding Chaos of its evil mindset and turning it back to Chaos 0. Tikal's spiritual form then approaches Chaos, and together they disappear in a flash of light.
Yeah, I ment to say that Dr.Robotnik found him and wanted Chaos to help him with his plans. I was sometimes confused that Dr.Robotnik made him for some reason, but I now know that he found him. If Chaos used both the positive and negative power of the Chaos Emeralds, Sonic wouldn't be able to go super right?