Musashi appears as a recurring Team Rocket antagonist. She pursues Celebi alongside teammates Kojirō and Nyarth, forming a temporary alliance with the primary antagonist, the Iron-Masked Marauder (Vicious), to capture the mythical Pokémon. This alliance ends abruptly. During the Lake of Life confrontation, the Iron-Masked Marauder captures Musashi after ensnaring Celebi with a Dark Ball. While restrained, she hears him reveal his true objective: using Celebi's power to overthrow Giovanni and seize control of Team Rocket. Her capture and exposure to this treason underscore the Marauder's extreme ruthlessness compared to standard Team Rocket operations. Within the film's conflict, Musashi's role is largely reactive. She participates in pursuing Celebi and Ash's group under the Marauder's direction but exerts minimal influence on the core plot involving Celebi's capture, corruption, or rescue. Her presence mainly reinforces the threat posed by the Marauder and Team Rocket. Following the Marauder's defeat and capture by the forest Pokémon, Musashi reunites with Kojirō and Nyarth near the lake, concluding her involvement. Her portrayal contrasts with the Marauder's unambiguously evil demeanor. While consistently antagonistic, her shock at his plan to betray Giovanni, coupled with her survival and reunion with her team, aligns her more closely with her established role as a persistent yet less malicious adversary within Team Rocket.