Before you do this make sure you have a vmu mini-game that stores tokens on your vmu. Now save your game a Sword's house. Than go to the nearest shop and sell all of your items.(sell legendary items to the rabbit guy). Than go to the monster house and buy as many tokens as you can and put them on your vmu. Now turn the system off and reload your save. You will have all of your stuff back but still have the tokens on your vmu. Do this as many times as you want and either sell the tokens for cash or trade them for good Items.