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Oakley is the main antagonist of the fifth Pokémon film, Pokémon Heroes. She is a teenage girl with lilac short hair and wears a lavender jumpsuit. Despite being Annie's younger sister, Oakley is the one who drives the plot of movie and is more willing to commit dangerous crimes.
Like her sister, Oakley is very charming, manipulative, tech-savvy, and thorough in her work. Both have vain, thrill-seeking personalities and a ruthless determination to succeed, but Oakley has a thirst for power that, once her mind is affected by the DMA, blinds her into behaving psychotically and ruthlessly, such as wanting to control the world with the oceans and willing to wipe out anyone who gets in her way.
Oakley and her sister, Annie are first seen in a library, reading a book on the history of Latios, Latias, and Alto Mare. When a security guard comes to their area, Oakley and Annie escape with the book before they can be spotted. As they make their getaway, Oakley discusses the last chapter of the book to Annie where it talks about the Defense Mechanism of Alto Mare and how to power and use it, through the Soul Dew, a gem containing the soul of a Latios. As Annie reminds Oakley that they need to capture Latios and Latias for Giovanni (Pokémon), they reach Alto Mare and compliment its peacefulness, noting it won't last long as they smirk evilly (indicating they plan to do more harm to the town than just capturing its Mythical Pokémon for their boss.) The next day, Oakley looks at her computer through a flying camera, looking for Latios and Latias. Oakley explains to Annie that the book said that both Latios and Latias can disguise with their surroundings or take on the shape of a human, leaving Annie impressed. Oakley says that the Pokémon have lower body temperatures so it would be easy to find them, just as her camera picks up a human with low body temperature. At this find, Oakley and Annie decide go pay their "new friend" a visit.
- Oakley, along with Annie, are one of few first main female antagonists introduced to Pokémon anime.
- Oakley and Annie's names are based on the name of Annie Oakley, an American sharpshooter and exhibition shooter.
- Oakley was voiced by Lisa Ortiz.
- In the Japanese version of the movie, Oakley and Annie are not introduced to being members of Team Rocket.
- According to James, in the English version, however, Oakley and Annie are well-known members of Team Rocket.