The Twinleaf Town Festival has concluded, and Ash and friends continue their journey to the town hosting Dawn's next Pokémon Contest. The three soon fall into yet another one of Team Rocket's traps. However, things are not what they seem. A mischievous Togepi stirs up trouble for everyone and in the end they must work together in order to stop Togepi.

The two Johto trainers decide to join Ash, Dawn, and Brock on their journey. While on the way to Dawn's next contest, the group stops near the Valley Windworks for Dawn to do some training. When Marill goes missing, the group heads into the windworks to find it, but once inside they are attacked by wild Pokémon and become trapped. Will they be able to escape the building?