Note: Using an action replay to alter your game may result in penalties, including being unable to access online features.
1. Turn on your Nintendo DS or DS Lite and insert the Pokémon Diamond, Pearl, or Platinum game.
2. Turn on your Action Replay DS or Action Replay Max device and insert it into the GBA slot of your DS.
3. Navigate to the "Codes" menu on your Action Replay device and select the "Enter Code" option.
4. Enter the following code:
```
94000130 FCFF0000
B21A68F0 00000000
D2000000 00000000
```
5. Select the "Activate Code" option to activate the code.
6. Return to the main menu of your Action Replay device and select the "Play Game" option.
7. Start the Pokémon game and play until you reach the Snowpoint Temple.
8. Once you reach the Snowpoint Temple, head inside and interact with the Regi statue.
9. A cutscene will play, and Regigigas will appear.
10. Battle and capture Regigigas as you would any other Pokémon.