All Pokemon level 100 cheat for diamond?

To use the All Pokemon level 100 cheat for Pokemon Diamond, you will need a cheating device, such as an Action Replay or Codebreaker. Once you have a cheating device, follow these steps:

Turn on your Pokemon Diamond game and load your preferred save file.

Open your cheating device software, and navigate to the Pokemon level 100 cheat. Typically, you can accomplish this by opening a particular section, such as "List Cheats, and then searching for 'All Pokemon Level 100" or something similar.

Enable the cheat

Return to your Pokemon Diamond game. All eligible Pokemon should have been levelled to be level 100.