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Drone Rotom (Japanese: ドローンロトムDrone Rotom) are Rotom inhabiting drones that act as the official judges for World Coronation Series battles. Like the Rotom Pokédex, the Rotom Phone, and Rotomi, this form of Rotom cannot be used in battle.
As soon as a battle appointment between two Trainers is made for a World Coronation Series match, a Drone Rotom is sent flying to the location where the battle takes place. The Drone Rotom can display a hologram picturing the participants in the battle and how many Pokémon they can send out. Like regular referees, it also explains the battle rules to Trainers. After the battle, the Drone Rotom will announce that the rankings have been updated and then leave the site.
Drone Rotom first appeared in Destination: Coronation!, where it judged the battle between Ash and Visquez. It since judged almost all of Ash's World Coronation Series matches. In Curtain Up! Fight the Fights!, five Drone Rotom flew over Wyndon while expelling colored smoke to form the logo of the World Coronation Series in the sky, in order to celebrate the start of the Masters Eight Tournament.