1. Enter a battle.
2. Get the person u want to duplicate items from.
3. Go to items menu.
4. Select an empty slot, then the item you want to duplicate by pressing up(This person must be holding the item).
5. Start running and press B.
6. Press X, then go to the equip menu.
7. Equip the item u unequiped durring the battle.
8. Have fun with the 2 items you now have.

Hints

1. Sell 1 item u duplicated and get money.
2. The Excalibur is worth more than the crystal sword.