When a trouble-causing starly runs into Pippin and Champ, Champ threatens to stop him by force if he doesn't calm down and stop attacking trainers passing by. To Champ's surprise, the starly is a girl, named Luna, who was abandoned by her trainer. Champ tries to convince Luna to make new friends and move on, rather than attack passersby, but Luna stubbornly refuses and the two end up battling. After Champ wins the battle, Luna is inspired by Champ's determination to avenge his trainer and decide to join him and Pippin.