TV-Series
Description
Smart Rotom de Ash, originally called Rotomdex, joined Ash Ketchum as his 87th captured Pokémon after an encounter at Professor Kukui's Alolan laboratory. This Rotom inhabited a Pokédex device to communicate through synthesized speech via the device's language software and voice synthesizer. Its core purpose involved cataloging Pokémon data, a task it performed with remarkable speed, demonstrated by photographing and documenting the entire Kanto Pokédex within hours during a regional visit. The Rotom displayed fervent enthusiasm for this role, often interrupting conversations to offer unsolicited Pokémon facts.

Personality-wise, it possessed a distinct fondness for photography and videography, frequently capturing images or recording videos. It became a dedicated fan of the Alolan detective show "Detective Laki," emulating the character by donning a Laki-inspired costume during its own mystery-solving attempts. The Rotom held the belief that watching detective shows could teach it investigative skills, reflecting its aspirational nature. Outside the confines of the Pokédex device, it reverted to standard Pokémon vocalizations for communication.

Throughout Ash's Alola journey, it served as a sentient guide, utilizing the Pokédex's onboard computer to educate about local Pokémon species. Its inherent ability to integrate with various machinery allowed it to adopt new functions, such as interfacing with laboratory equipment or other electronic systems. Following Ash's return from Alola, the Rotom transitioned into a Rotom Phone for his subsequent adventures. This new form maintained its core identity and capabilities while gaining enhanced mobility and connectivity features.

In Pokémon Journeys, the Rotom Phone continued as Ash's companion under Professor Cerise's oversight. It functioned as a vital navigational and informational tool during Ash's World Coronation Series challenge, tracking opponent data, scheduling official battles, and monitoring rank fluctuations. The device also supported Ash's use of specialized battle mechanics like Dynamax, Z-Moves, and Mega Evolution by managing corresponding equipment such as the Dynamax Band and Z-Power Ring.