This is a Gamecube/Wii homebrew application for sending GB/GBC roms to a GBA with a link cable.
All you need is a folder called "roms" on the root of your main device (SD Gecko on Gamecube and SD/USB on Wii) containing GB/GBC roms.
After starting GoombaSend, you can select roms with the D-pad and A (or cancel selection with B) to transfer to your GBA in controller port 2.
This project uses Goomba v2.30 as the Game Boy emulator.
Please note that because this is all stored in the GBA RAM, the max file size including Goomba (42.4KB) is 256KB. The usable space for rom transfer is 128KB.
Also, you won't be able to save whatsoever since this is all just temporary.
GoombaSend was originally made by FIX94, I only updated it to allow support for multiple roms and easier menu controls.