Go to the bookshelf that is in the corner of your room, go to the "Password" section and choose the mobile symbol.
|2110-3875-1734||Milk for a month|
|0338-4272-1332||Shiny gold veggies|
Contributed By: Supercrazy370.
Select and have your character hold the item you wish to duplicate, Now move your character to "exit" the item screen. Press B to put the item away and quickly select another item and press A. The first item you were holding will now be duplicated. This is works on Key Items also.
Contributed By: FredoBaggumms.