Get the codes from some cheat website Go to the thing that says cheats on top. A box will open up and you select game shark If you are playing Pokemon (for example) a)You will have to type in a master-code(given with cheats) b)For Pokemon you will have to: Name: Rayquaza Code:xxxxxxx xxxxxxx xxxxxx x xxxxxxx and press OK.
When you go look in the grass rayquaza appears. To deactivate it go back to the game-shark area.
You will see tick marks in boxes. Deselect it and look in the grass again rayquaza won't appear. I deleted the old answer because it said to just buy a new computer. To play Pokemon Emerald using the Visual boy advance on a Mac here are the steps. When you open VBA and it asks you which game to open, click Cancel. This does not close VBA.
Go to options of VBA and click Add codebreaker/Gamesh ark codes(they are unable to be used while a game is on this is why you click Cancel). After you enter the codes click Ok. Then go to Open Roms and choose Emerald. To activate the codes I have found you must press a combination of keys similar to no$gba.
User guide: Cheat codes. You can enter a name for the cheat. VBA standalone expects AR/GS v1/v2 formatted as XXXXXXXXYYYYYYYY (no spaces) but AR v3 formatted. Im on macbook pro, and i'm trying to enter a cheat on pokemon gold, and anyways the option of 'gameshark' is grey, so i cant click it!!!
These keys are Left and Right Option buttons on the keyboard along with the Left control button. I'm not entirely sure how it works, but it's the only solution I've found. Warning: The codes for Emerald are really buggy and crash the game frequently, by exiting VBA it will remove the codes and your game will be normal. The only codes I've found to work are the Pokemon modifiers on Supercheats.com Hope that helps. I too had issues with using GameShark codes on my mac, but now I have fixed this problem! I made a very detailed YouTube video how to enter GameShark codes on mac, and shown a working example. Check out my video: Enjoy!
EDIT: Sorry I moved the vide o. You can watch it here: March 31st, 2012 Edit2: These codes dont work for emerald version. I have found a solution for people looking for Emerald. Took me forever. When you open VBA and it asks you which game to open, click Cancel. This does not close VBA. Go to options of VBA and click Add codebreaker/Gameshark codes(they are unable to be used while a game is on this is why you click Cancel).
After you enter the codes click Ok. Then go to Open Roms and choose Emerald. To activate the codes I have found you must press a combination of keys similar to no$gba. These keys are Left and Right Option buttons on the keyboard along with the Left control button. I'm not entirely sure how it works, but it's the only solution I've found. Warning: The codes for Emerald are really buggy and crash the game frequently, by exiting VBA it will remove the codes and your game will be normal. The only codes I've found to work are the Pokemon modifiers on Supercheats.com Hope that helps.
Video: That video goes into detail on how to use cheats Emerald VBA using Mac.