Instructions
Open Visual Boy Advance and start "Final Fantasy Tactics."
Scroll up to the top part of the screen and click on the "Cheats" button to open the "Cheats" menu. Click the "Automatic save/load" option. This enables VBA to save the cheats you entered.
Return to the "Cheats" menu and click on the "Cheats List" option. Click on the "Add GameShark" button. Enter the name (description) of your cheat and the cheat itself; press the "OK" button. For your cheats to be activated, you must enter the "Master Code" cheat for "Final Fantasy Tactics" first.
Inspect the codes you entered to see whether they are enabled. Check the box to the left of the codes to enable them. Enabled codes will also have an "E" to the left of their description. Once codes are entered and enabled, you can begin using them.