While resting on their journey, Clemont's Chespin gorges itself on all the treats that Serena has made, and it starts to show as Chespin gets fatter. Clemont is intent to help Chespin get back into shape, but when it loses in two battles that were intended as exercise, Clemont decides to create a machine to help Chespin get into shape. However, once it's complete, Chespin is nowhere to be found. Will Clemont find Chespin and be able to help it get back into shape?

While on their travels, Ash decides that it's time to train his Froakie. During the training, they end up meeting a ninja trainer and his Pokémon Frogadier, the evolved form of Froakie. Ash challenges him to a battle, but ends up losing. Ash is eager to improve with Froakie and requests the trainer's help to teach Froakie Quick Attack, so the four of them start to train hard. However, things start to go wrong when Team Rocket appear. Will Froakie manage to learn Quick Attack?