Ultimate G-merl

Ultimate Gemerl (アルティメットジーメル) is the Super State of Gemerl, achieved by absorbing the power of the seven Chaos Emeralds. He is the true final boss of Sonic Advance 3 at the level Nonaggression.

Physical Appearance
As Ultimate Gemerl, Gemerl undergoes a drastic change in appearance. His former humanoid body becomes a large black robotic orb exceeding a meter in diameter, with four extendable grey claws-like hands on his sides.

On his orb-like body, Ultimate Gemerl has a yellow four-pointed star-shaped piece, which is split in half, attached, with a small blue orb in the center. In each of the corners of this yellow piece, Ultimate Gemerl has what appear to be blue eyes with red trims, giving him a total of four eyes on the surface of his body. In addition, Ultimate Gemerl has on the left side of his body a "mouth piece" which hides another blue orb.

History
After Sonic the Hedgehog and his friends defeated Hyper EggRobo at Altar Emerald, Gemerl and Dr. Eggman attempt to make their escape, as the doctor spouted off his assurances of vengeance at Sonic as usual.

While Sonic chased after them, however, Gemerl fell down to the ground and began short-circuiting. Then, without warning, presumably due to his battle damage and Emerl's data, Gemerl struck Sonic with a charge, forcing the blue hedgehog to drop the seven Chaos Emeralds he had collected. Gemerl then stole and harnessed the seven Chaos Emeralds' power and transformed into Ultimate Gemerl. After his transformation, Ultimate Gemerl first act was to betray Dr. Eggman, by grapping the doctor in his Egg Mobile and throwing him at Sonic. Ultimate Gemerl then took off into space to cause more havoc elsewhere, but not before discarding the Chaos Emeralds, which fell back to the surface.

After having made it into space, Ultimate Gemerl was pursued and challenged to a battle by Super Sonic and Dr. Eggman, the two of them having put aside their personal vendettas to stop the rogue robot. Ultimate Gemerl fought the unlikely duo, but was ultimately defeated and reverted back to normal in a large explosion, before falling back down to Earth.

Powers and Abilities
With the power of the seven Chaos Emeralds, all of Ultimate Gemerl's powers and innate abilities in his original form are multiplied several times over, making them extremely potent.

In this state, Ultimate Gemerl can freely fly through the air and in the vacuum of space, though he is not as fast as Super Sonic. When in battle, Ultimate Gemerl can extend his claws from his central body and use them to attack the opponent. These robotic limbs are able to extend great lengths in any direction and possess enough physical strength to knock away even super transformed characters and leave them disorientated for a few seconds.

By using his extendable claws, Ultimate Gemerl can perform a multitude of powerful attacks; from each of his claws, Ultimate Gemerl can fire small beams that can freeze even Super Sonic for a few movements and launch small missiles. Also, by joining two of his claws together, he can form and fire large energy beam.

Besides offensive powers, Ultimate Gemerl possesses as well high physical resilience, nearing that of complete invulnerability, even from other super transformed characters. His only weak spot is the blue orb inside his mouth piece, which is still vulnerable to damage. This orb, however, is protected by Ultimate Gemerl's mouth piece, which, as seen so far, can only be forced open for a few seconds when Super Sonic performs a Tag Action with Dr. Eggman, charging up the doctor and his Eggmobile with energy and throws him at Ultimate Gemerl's mouth piece.

Trivia

 * Ultimate Gemerl is the first Super State in the Sonic the Hedgehog series not to have the prefix "Super" or "Perfect" in his name.