EDIT: Note this tutorial is outdated and a lot more progress has been made since I first wrote this many years ago. The easiest way to get into modding these games is to use my Hack tools (currently mac only but the windows version is in beta testing in the discord server).
We have a discord server for everything Pokemon Colosseum, XD and Battle Revolution hacking here: https://discord.gg/xCPjjnv
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I can finally start posting all the data I have so fa