I have been answering Pokemon Questions all day so go on YouTube and type in "Catching Darkrai without and action replay" and follow it. It takes a while, so be patient. I could tell you, but I can't be stuffed. Sorry!
Another way is to type in this code on your action replay:
94000130 FCFF0000
B21C4D28 00000000
B0000004 00000000
0000AA3C EDB88320
2000AA68 00000008
D2000000 00000000
Hold L and R, and walk into the Pokemart. Or, you can connect to Wi-Fi on certain days to get a mystery gift. If you don't want to type in the code above, go to Full moon island, and use walk through walls to get to New moon island. It really helps if you have the poketch, Marking Map, so that you won't get lost, and have to turn your DS off. I went ther and there wasent a darkrai it was something called a cresseliaIt WAS available to get, cuz it was an event... now you wont be able to find him again unless they make a new darkrai event... sorryat fullmoon island
you need action replay for this code. go into the pokemart holding l+r and then talk to the man in green then go to canalave city go into the door that was locked and rest and you will be on new moon island
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Glitch for it! On Google type in: Tweaking glitch for Pokemon Platinum. find out how to do it and then Type in: How to get darkrai using the tweaking glitch on platinum.
darkrai and arcus
You have to trade from diamond or pearl
i think you can only get it at a Pokemon event or with Pokemon ranger 2 (with out cheats.)
Darkrai is unobtainable in the original Hoenn games and before. He was revealed in Diamond, Pearl, and Platinum first, which were made way after Emerald.