Dr. Eggman's Robots
From the Super Mario Wiki, the Mario encyclopedia
Dr. Eggman's Robots (also referred to as Tricksters Bonus 1 and Tricksters +1) is the first Tricksters bonus episode in the Story Mode of the Nintendo 3DS version of Mario & Sonic at the London 2012 Olympic Games. The episode is unlocked after completing Junior Triumphant!, and unlocks An Old Urn once it is completed.
Dr. Eggman is testing Metal Sonic in a taekwondo match, with Orbot and Cubot refereeing. Dr. Eggman easily beats Metal Sonic, causing Orbot and Cubot to suggest that Dr. Eggman may have programmed Metal Sonic to lose to him. Dr. Eggman decides to try to find a better way to test Metal Sonic, and suggests that Orbot and Cubot compete against him, though they point out that they are not athletes and they lack legs. Dr. Eggman tells them he was joking and to help him come up with an idea. The group notice Waluigi on one of the camera feeds, and set off to find him as an opponent for Metal Sonic. Orbot and Cubot immediately approach Waluigi and ask him to challenge Metal Sonic, though Waluigi refuses and prepares to run off. Dr. Eggman arrives, and convinces Waluigi to compete by offering to help him win the title of Superstar from Luigi if he can prove himself against Metal Sonic.
Metal Sonic manages to defeat Waluigi, and Dr. Eggman tells him that their deal is off, so Waluigi decided to go to train so he can win the title by himself. Dr. Eggman notices that during the match, Metal Sonic lacked the power he would require, and heads back to his lab to make further modifications to Metal Sonic.