Dedenne Is Pichu, Pichu Is Dedenne...!? : Season 17 Episode 16

As our heroes continue their journey to the Shoyo City Gym, they stop at a Pokémon Center, where Nurse Joi declares all their Pokémon are in perfect health. A Trainer named Rena and her young sister Rimu are there as well. When our heroes prepare to leave, Eureka accidentally grabs the wrong bag, but doesn't realize it until later, when she looks inside. Dedenne is gone, and in its place? A Pichu. Realizing Eureka grabbed the wrong bag, our heroes go back to the Pokémon Center and Nurse Joi recalls the "little girl with the red ribbon in her hair", so off they go in ...