Instructions
GameShark Device
Select "Pokemon Emerald" from the list of game names on your GameShark.
Find one of the cheat codes you wish to remove in the list and press "Right" on the D-pad.
Press "Select" to delete the cheat code. Press "A" to confirm.
With an Emulator
Open your emulator's cheat code list. For the Visual Boy Advance, click the "Cheats" menu and select "Cheat List." For No$gba, select the "Utility" menu and choose "Cheats."
Remove all cheats in your emulator's cheat list.
Save your game normally.
Close and reopen your emulator. Reload "Pokemon Emerald," and the game will be back to normal.