Hometown Story - 3DS Cheats
Super Gamer Dude
When you are in the shop you can duplicate items. You first need to take out the item you wish to duplicate and then move your character within your shop (it doesn't matter where). Then, press B to put away the item. Quickly, before the animation depicting your character putting the item away concludes, select a different item from your inventory. Press A to confirm that selection.
If you do this properly you will now have the item duplicated. The process must be completed very quickly or it won't work.