Hobbies And Interests
Master Code
Action Replay codes have a Master Code required for all other codes to work. The codes are different depending on the type of codes you're enabling. For example, all items, balls and moves require one Master Code, while the codes for getting specific Pokemon require a different Master Code. Master Codes are usually at the top of the list and designated as "(m)" on the code list.
"In PC" Codes
All regular items in the game have an "In PC" code that deposits 99 of the given item into your in-game PC's first slot. Before activating one of the codes, go to the nearest "Poke Center" and open your PC. Ensure the item in the first slot isn't something you want, as you'll lose this item upon enabling one of these codes.
Poke Ball Codes
The Poke Ball codes give you 99 of your desired Poke Ball type. Like the item codes, the Poke Balls replace whatever type of Poke Ball you have in slot one of your bag's "Poke Ball" section. For example, if you currently have five regular Poke Balls in the first slot and you enable the "Master Ball Slot 1" code, your five Poke Balls get replaced by 99 Master Balls.
Code Sets
The codes to get all "Key Items," "TMs and HMs" and "Berries" come in sets. Since there are so many of each item, you can't get them all with just one code. Enable the codes one at a time to get a portion of those items. After checking your bag to ensure you got the items, disable the code and enable the next set, continuing until you have all of those moves or items.
New Pokemon Codes
The "New Pokemon Codes" and "Old Pokemon Codes" work differently. Enable the code for the new Pokemon you want and go to the nearest "Poke Center." Go to the PC and choose "Someone's PC." After selecting "Withdraw Pokemon," you'll find the Pokemon whose code you entered in the first slot of "Box 1." Either withdraw the Pokemon or select "Move Pokemon" and set it in any slot other than the first before deactivating the code and enabling the code for another Pokemon. Otherwise, the new Pokemon will replace the previous inhabitant of the first slot in "Box 1."
Old Pokemon Codes
The "Old Pokemon Codes" let you encounter a specific Pokemon in the wild. After enabling a code in the "Old Pokemon Codes" list, walk around in the tall grass until you experience a wild Pokemon encounter. The Pokemon you encounter will be the Pokemon whose code you've enabled. After catching it, disable the code to enable normal wild Pokemon encounters.
Considerations
Enabling many codes at one time may cause the game to freeze or glitch. The Action Replay manual suggests enabling no more than 20 codes at one time. For item, Pokemon and move codes, after you receive them, you can deactivate the code and still have the item, moves or Pokemon. "Pokemon Sapphire" should be automatically recognized by your Action Replay. If not, use the PC software that came with the AR to update the software, giving you the codes.