Eggrobo (Sonic Lost World)

Eggman's ultimate weapon is the last boss of Lava Mountain and the final boss of Sonic Lost World. Dr. Eggman pilots a huge mech that harnesses the energy of Sonic's world from Eggman's Extractor.

History
After seeing Eggman fall off a bridge in Lava Mountain, Sonic and Tails make their way to Eggman's energy extractor. Prior to their arrival, Eggman shows himself piloting his newest mech. He reveals that he faked his death in order to get away from Sonic long enough to power up his mech using the energy the Deadly Six stole from Sonic's world. Sonic then defeat his mech and Tails brings the energy back to their world. Eggman makes a hasty escape on his jetpack, but on account of his jetpack not working (courtesy of Sonic "borrowing" the exhaust hose), Eggman falls off Lost Hex, somehow surviving, albeit with only half of his mustache due to a rabbit mistaking it for a carrot stalk.

Trivia

 * Oddly enough, the design of the torso resembles Classic Robotnik's wardrobe similar to the Death Egg Robot.
 * The design also has alot of nods to other mechs Eggman has made in one media or another. It has a cape similar to Metal Robotnik, can separate into different parts like both the Egg Dragoon and the Time Eater (even having the same basic attack), and on its back are energy canisters much like the Egg Nega Wisp. It also fights almost exactly like the Egg Nega Wisp, to the point of even having the Eggman "firework" at the end, just like the end of the Egg Nega Wisp's battle.