Ash, Clemont, and Bonnie hurry to Professor Sycamore’s lab in order to have him help heal Froakie who was injured in battle with Team Rocket. At the lab they discover that Froakie has left all of its trainers and returned to the lab every time. While Froakie heals, the Professor tells everyone about how he and his team are studying Mega Evolutions; a temporary evolutionary stage for certain Pokémon. Upon hearing this, Team Rocket enter the lab and take control of the Garchomp staying there. Garchomp becomes outraged and starts rampaging around Lumiose City. Ash, Clemont, and Bonnie decide to stop it. Meanwhile, Serena trains with her mom so she can learn to ride Rhyhorn.