Callahan, a resident of Fula City, attends the annual Wind Festival alongside his younger sister Mia and her niece Kellie. Plagued by low self-esteem, he compulsively spins grandiose fabrications to mask his insecurities, even falsely claiming credit for summoning Lugia to quell a mountain fire. His deceit fractures familial trust and culminates in public humiliation when presentation footage exposes his lies.

Initially partnerless, he borrows Toren’s Staryu for the Pokémon Catch Race, where he rescues a Sudowoodo from a Golduck. Despite rejecting its persistent loyalty, a crisis involving toxic gas forces a change of heart when Sudowoodo retrieves the Poké Ball Callahan discarded in frustration. Capturing the Pokémon marks a pivotal shift, as its steadfast companionship challenges his self-doubt and inspires selfless action.

Amid the festival’s escalating disasters, Callahan guides Harriet to a failing power plant, aids in restarting its turbine, and hurls a Lum Berry antidote into a windmill’s blades to neutralize airborne spores. These deeds, paired with mending familial bonds, reflect his transformation from a boastful outsider to a reliable community member.

Kellie’s admiration initially drives his lies, but her safety becomes his priority during the crises. His growth is further cemented by accepting Sudowoodo as his partner and leveraging his pinpoint throwing skill—previously used to win Kellie a festival prize—to resolve the catastrophe. Callahan appears exclusively in *The Power of Us*, with no documented appearances in other seasons, movies, OVAs, or spin-offs.