Here's why:
* Deoxys is from Generation III: Deoxys is a Pokémon introduced in Generation III (Ruby, Sapphire, Emerald).
* Code Breaker Functionality: Code Breaker is primarily used for cheat codes and altering game data. It doesn't allow you to add new Pokémon that were not originally in the game's code.
To get Deoxys, you would need to:
* Transfer from a Generation III game: You could trade Deoxys from Pokemon Ruby, Sapphire, or Emerald to a compatible game (like Pokemon FireRed or LeafGreen) and then potentially transfer it to a later generation game.
* Use an external tool (not recommended): There might be unofficial tools or mods that allow you to add Deoxys to Pokemon Ruby, but these are often unreliable and can potentially corrupt your game.
Important Note: Using cheats or unauthorized tools can violate the terms of service for Pokemon games and potentially lead to problems with your save file.