Wild Arms Cheats

First, make sure that you have only ONE of the item that you want 255 of, any more sort of screws up the process. Next, get into any battle(I would suggest one on the field around Adlehyde so you're only being hit by Balloons, Pillbugs, or Goblins). Have Rudy use a Heal Berry, then have Jack use one too. Have Cecilia select the Heal Berry and switch it with the item you want duplicated, then exit the item screen and have her defend. After the turn is over, you can complete the battle as you please, because you'll have 255 of the item you switched with the Heal Berry!