Use or JKSM (homebrew apps) to export/import saves easily. Without homebrew: Save files are encrypted per console — you cannot simply copy another console’s save.
: Search for the hex string of your current money value in the save file to locate and edit the amount. Checkpoints
For older homebrew setups, JK’s Save Manager (JKSM) works similarly. It allows for "cartridge to SD" injection.
I know save file injection can be tricky with 3DS encryption, but if anyone has a .sav file or a Backup Archive they can upload, it would be a massive help.
: While the game provides a brief summary of the first title's plot during the intro, it is largely a standalone adventure that pays homage to previous crossover events. Save Data Benefits & Bonuses
: Saves are located in the Nintendo 3DS folder on your SD card, organized by unique Title IDs.