Instructions
Load your saved game of "Pokemon Sapphire" in the Visual Boy Advance emulator.
Click "Cheats" from the top toolbar. A drop-down menu will appear.
Click "Cheat List" to open up the VBA's cheat program. A new window will appear.
Click "GameShark" in the middle of the page. A new window will appear.
Type "148ACF21" without the quotation marks in the "Code" input field.
Click "OK" to close the window and save your changes. You will receive the "Rare Candy" when you resume the game.