Things You'll Need
Instructions
Connect your Pokemon game to the Action Replay and plug it into your DS.
Start the DS and enter the following code at the codes screen:
94000130 FCFF0000
B2101140 00000000
0000B5D4 00000008
D2000000 00000000
Start the Pokemon game. Load your save file. Find the Member's Pass in your inventory.
Travel to the motel in Canalave City. Rest in the room. During the night, Darkrai will visit you. The next day, your map will reveal his location.
Travel to the shipping dock and show the map to the sailor. He will take you to New Moon Island, where you can battle and capture Darkrai.