Custom Brobot battle for Super Paper Mario
Releases of the mod and the save file are in here
To install the mod, install Flipside-Mod-Manager, and unzip the release of this mod into the mods folder, then follow the instructions on that github This is a rel mod, you will need a gecko code as mentioned in the How to use section of FMM
If Flipside-Mod-Manager isn't working for you, use the alternative install guide.