Things You'll Need
Instructions
Insert the "Pokemon: Diamond" cartridge into the Action Replay, and then insert the Action Replay into the Nintendo DS. Press the "Power" button on the Nintendo DS to start the Action Replay.
Scroll down the list of video games and highlight the "Pokemon Diamond" game. Press "A" to enter the video game's menu. Highlight and choose the "Add a New Code" option.
Use "Rayquaza" as the code's name, and then press "A." On the next page, insert the following password: "94000130," "FCFF0000," "B21C4D28," "00000000," "B0000004," "00000000," "10001170," "00000180," "D2000000" and "00000000." Press "A," and then press the "Save" button.
Scroll down the list of cheat codes, highlight the "Rayquaza" cheat code, and then press "A" to enable the cheat code. Press "Start" to power up the "Pokemon Diamond" video game.
Start your saved game, and then press "L" and "R" to activate the cheat code. Visit the Mining Museum in Orberg City and talk to the man at the front counter. He will give you a level 20 Rayquaza.