During the events in Dahara City, Bonnie arrives as part of Ash's group, transported through a mysterious ring portal after Hoopa steals their donut-shaped Poké Puffs. She demonstrates her characteristic enthusiasm for Pokémon throughout the film. When the group learns that recreating the Prison Bottle requires Fire, Water, and Ground power, Bonnie remembered encountering a wild Hippopotas near the desert Pokémon Center they previously visited. She suggested using this Hippopotas to provide the necessary Ground-type power. Hoopa transported the Hippopotas to Dahara Tower via its rings, enabling the group to proceed. Bonnie remained present with the group inside Dahara Tower during the climactic conflict involving multiple summoned Legendary Pokémon, witnessing the resolution where Hoopa overcame its shadow and helped stop the chaos. Her actions reflect her typical role as the youngest group member, contributing observations and supportive ideas rather than direct combat or complex strategy.