This transformation exists primarily within the Adventures of Sonic the Hedgehog continuity. Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
After traveling through time and space, Dr. Robotnik obtained the four Chaos Emerald (Invisibility, Invincibility, Immortality, and the Power of Life). By wearing all four emeralds together, Dr. Robotnik transformed into the Supreme High Robotnik. Hoping to finally destroy his enemies, he sent Sonic and Tails through time to the Big Bang. However, they returned with four additional Sonics and Tails from different points in time. The team of heroes that now consisted of ten all worked together to steal back the Emeralds and return them to their original places.
Powers and abilities
In this state, Robotnik is granted power so great that he claims he could rule the entire universe.
By wielding all four Chaos Emeralds at the same time, the Supreme High Robotnik has direct access to all the emeralds individual powers at once; With the Chaos Emerald of Invincibility and the Chaos Emerald of Immortality the Supreme High Robotnik is granted immeasurable strength, invulnerability and is successfully immortal, the Chaos Emerald of Invisibility allows him to turn himself invisible and the Chaos Emerald of Life allows him to animate anything.
Despite Supreme High Robotnik having no weaknesses, he is still vulnerable to surprise attacks, and he will lose all his powers if somebody removes the necklace with the Chaos Emeralds attached to from around his neck.