Ash, Serena, and Bonnie have finally rejoined Clemont in Lumiose City. Ash can’t wait to get their Gym battle started, but it’s quickly interrupted by Officer Jenny...who places Clembot under arrest! Security footage shows a robot that looks just like Clembot vandalizing several businesses around the city. Clemont sets out to prove Clembot’s innocence with the help of the journalist Alexa, who’s been trying to track down a mysterious man in a Blaziken mask as a possible witness.
At Alexa’s advice, Clemont investigates the Prism Tower computer where Clembot’s blueprints are stored. Sure enough, a robotics researcher known as Doctor Belmondo has hacked into the computer and stolen the blueprints to create a Dark Clembot of his own! Our heroes catch the pair red-handed at the Lumiose Museum, where Clembot defeats Dark Clembot in a Pokémon battle and Belmondo confesses everything.
With Clembot’s good name restored, the stage is set for the Gym battle between Ash and Clemont!