Charm duplication glitch (JP/KO/AS Versions Only)
This glitch nets you an unlimited amount of Checks (AKA Charms) of any kind. The trick is to sell them so you can max out your Gald and Stamp Cards quickly (which is good for early Rare weapons and armor). First, select e a Check to duplicate (e.g. Curse Check). Have a total of 3, and equip them all. Then, select a Check to sacrifice (e.g. Poison Check). Have a total of 2. Now enter your Dualize menu and, for item #1, choose an equipped Curse Check. For item #2, choose the 2 Poison Checks and dualize them all at once. Now exit to the shop menu and go to Sell. You will have 255 Curse Checks and can sell up to 127 of them at a time. Your supply will instantly revert back to 255.