Shelly acts as an administrator for the villainous Team Aqua, overseeing research on Primal Kyogre and supporting leader Archie's ambitions. During an operation at the Weather Research Institute, she uncovers critical intelligence revealing the catastrophic consequences of awakening Primal Kyogre: it would "sink everything and bring despair to the land." Despite her allegiance to Team Aqua, she attempts to intervene when Archie proceeds with the awakening in an underwater cavern, explicitly warning him of the impending disaster, only to be ignored. Following Kyogre's transformation, she becomes trapped aboard the Team Aqua submarine "Explorer 1" as the enraged Primal Kyogre initiates a global cataclysm and turns its aggression toward the vessel.

Beyond Pokémon Generations, Shelly features in other official media. In the games Pokémon Sapphire, Alpha Sapphire, and Emerald, she battles players at locations such as the Weather Institute and Seafloor Cavern. Pokémon Masters EX depicts her cautioning against the reckless use of Kyogre's power and later collaborating with former rivals to resolve a crisis involving legendary Pokémon under external control.

Her physical design underwent notable changes between earlier game appearances and later adaptations like Pokémon Generations, featuring more detailed clothing and attributes. This redesign prompted interpretations treating the differing designs as separate individuals sharing the same title. Information regarding her background, main anime series activities, or detailed manga storylines is unavailable in the provided sources.