No more fuss. Lemme explain this.
- Get a .sav file, either from an old playthrough, or from the Internet.
Like this one, for example.
- Start a ROM of the game in an emulator (like VBA-M) with the same name as the sav and in the same folder as the sav.
- The save should load
- Export the battery save (VBA-M: File > Export > Battery File)
- Start a save on your 3DS VC
- Export the save through a save manager (like JK's)
- Get to the 3DS save you dumped
- Check your battery save's size. It has to be 32KB to work.
- Rename your battery save to sav.dat
- Replace the sav.dat in the 3DS save with the sav.dat from your computer.
- Reinject your save through a save manager (like JK's)
- Boot your VC game
- ???
- Profit