These simply add the key item to your bag. They do not break the game.
This is where the humble yet powerful usrcheat.dat file enters the picture. If you grew up playing Pokémon Diamond on a Nintendo DS (or an emulator) and used an R4 card or an Action Replay, this file was your golden ticket to godhood. usrcheat.dat pokemon diamond
Here are typical codes found in good cheat packs (e.g., or RetroGameFan’s updates). All examples are for US version ( ADAJ ). These simply add the key item to your bag
usrcheat.dat file is a legendary artifact for anyone who spent their childhood (or adulthood) playing Pokémon Diamond usrcheat.dat pokemon diamond