How do you undo the all cheat on FireRed?

To undo all the cheats in FireRed, do the following:

1. Open the cheat list by pressing 'L' + 'R' + 'Select' at the same time.

2. Use the 'D-pad' to navigate to the 'All' cheat category.

3. Press the 'A' button to disable the 'All' cheat.

4. Press the 'B' button to close the cheat list.