Infinite Armor
In "Mobile Suit Gundam: Federation Vs. Zeon," rather than having a health bar, a mobile suit has an armor gauge. Every time the player is hit they lose armor. When the gauge reaches zero, the mobile suite will be destroyed, killing your character. By using this code with your Action Replay, your mobile suite's armor gauge will never deplete. The code is:
JFPN-ZXM5-0RTAH
3MTK-EBBK-VHQP1
U8RX-B4Y8-U07RU
Infinite Primary Weapon Ammunition
Just as in real life, every time your mobile suit fires its main gun, it depletes some of its store of ammunition for that weapon. Failing to use these stores of ammo judiciously can result in your mobile suit being defenseless in battle. Using this code will make it so your main gun never runs out of ammunition:
XV1E-C87H-EE5Y6
6YUV-NBW1-GNU6R
Infinite Secondary Weapon Ammunition
Every mobile suite has two weapons, a primary weapon for general use, and a secondary weapon that is more specialized. Like the main weapon, the secondary weapon has only so much ammunition on board the mobile suit. This code will make it so you never run out of secondary ammunition:
7KJE-EB4F-0HUZC
4Y1G-ECCH-8K1N5
Infinite Time
Many of the missions are timed. Failing to complete your objectives in this time limit results in mission failure, and causes you to start over again just as if your character had died. By entering this code into your Action Replay, the timer will never start, giving you an unlimited amount of time to complete your goals:
981X-7ZW9-4U53E
VHTV-5350-AJ11P
Using the PS2 Action Replay Cheating Device
The Action Replay for the PS2 comes with a USB cord to connect it to your computer. It also comes with a disk to install its proprietary Code Manager software to download or manually enter codes. Virtually all codes you want to use will have to be manually entered since this version of the Action Replay is quite old and so there aren't a large selection of code websites to download from.
Unlike in subsequent generations of the Action Replay, any code entered into the Code Manager will be active when you turn your game on. There is no option to turn the codes off without deleting the code in the Code Manager.
After entering your codes, remove the square cover on the back of your PlayStation 2. There will be a tab on the side. Push this tab to pop it out. Plug the Action Replay into the slot underneath. When you next turn your PlayStation 2 on, your Action Replay will be in effect.