Bart was in the middle of training Millie, a new employee. He was also in charge of protecting the data on the ancient Pokémon, Kyogre and Groudon, all accessed with a key card which he kept on his person at all times.
When Team Aqua overran the Institute, Bart gave the key card to his Castform and told it to give the data to Millie. Along with Ash and his friends, Millie kept the data out of Team Aqua's hands. However, Millie turned out to be a double agent called Brodie, a member of Team Magma and master of disguises. He flew away on his jet pack with the data on ancient Pokémon.
Bart was freed by Ash and the others. Moments later, the real Millie showed up at the Weather Institute for her first day. Bart quickly showed her to a chaotic study room, and Millie gladly agreed to manually re-enter all of ancient Pokémon data into the Institute's computers.
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|Castform is Bart's main Pokémon and plays an important role in the Weather Institute's meteorological research.|
|Debut||Unfair Weather Friends|
|This article is part of Project COD, a Bulbapedia project that aims to write comprehensive articles on each one-time character of the Pokémon anime.|