For on a GBA emulator (which typically runs the Game Boy Color version of the game), you can use GameShark codes to modify your experience. Most emulators, like VisualBoyAdvance (VBA) , require you to enter these in the "Cheats" or "Cheat List" menu. Essential GameShark Codes
These are the most commonly used codes for general gameplay: : 010138CD . Pokemon Yellow Gba Emulator Cheat Codes
Note: You can find a complete list of Hex IDs on the Glitch City Wiki. How to Use Cheats in Pokemon Games on DeSmuMe For on a GBA emulator (which typically runs