IMPORTANT: In this part we're actually going to get A LOT of money. The way to achieve this is to get an Onmoraki and level it up until it has learned Pulinpa and Confuse Boost. Then fuse it into a Sandman and continuously level it up by sacrificing the Treasure Demons. This is why I told you to get as much money as possible in the last dungeon. When leveling up Sandman through Sacrifice Fusion you need to make sure that Luck and at best only one other stat is going to level up. If not, reload until it does. Sandman needs to have as much luck as possible. 50 luck would be best.
After that it's time to search for a Mementos boss who canonically has a lot of money (like the couple extorting money from Kawakami). Confuse them and wait for them to throw money at you. The higher the luck your Persona has, the more money they will throw and the more often as well. You can easily get millions of money that way. I would also advice you to set the difficulty to easy and go alone into the battle since this will speed things up.
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