On the road to Anistar City, Ash and friends fall into a Team Rocket pit trap! Pikachu quickly sends the villains blasting off again. Then the ground underneath our heroes collapses, leaving them in an abandoned subway tunnel.

Bonnie is reminded of when she and Clemont first met Bunnelby, who was living in an old subway car in Lumiose City with a group of Pokémon. The group was being threatened by a grumpy Diggersby who wanted the train for itself! Thanks to some battling tips from Clemont, Bunnelby managed to defeat Diggersby and protect its home.

Soon after, the subway car was in danger, and Clemont, Bonnie, Bunnelby, and all its Pokémon friends—now including Diggersby—had to work together to move it to safety! After the train found its new home, Clemont and Bunnelby sadly parted ways...but Bunnelby’s friends had a better idea. They encouraged Bunnelby to go after its newly chosen Trainer, and the rest is history!