Unlimited Tokens
Download the "Stuff" mini-game to your VMU. Then, save your game. Now sell everything you have and go to the Monster House. Here, buy as many tokens as you can afford and put them in your VMU. Reset the game, then load the game file. You should have money, your items and tokens. Sell the tokens and then save the game. Go back to the Monster House to and do the same thing as much as you want.

Hidden Artwork
Insert your disc into your PC. You will find lots of .bmp files in the BMP directory.