Where do you get antidmg in mmbn3?

In MegaMan Battle Network 3, you can obtain the Antidmg (Anti-Damage) Battle Chip from the folder of the character called "GutsMan." Specifically, you can find it in the "Aqua" folder after defeating the Aqua-based NetNavis. Additionally, you can also acquire it by trading with other players or through certain in-game events. Make sure your folder is well-organized to maximize your chances of drawing it during battles.