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YoU can't, sorry
There is not a known Darkrai Action Replay Code for Pokemon HeartGold and SoulSilver yet.
The only way that you can et Darkrai without an action replay is to go to a Pokemon event that happens once every six months at places like argos and you get a membership card to get in the inn at canalave city.
Sadly no, but u can try using an Action Replay to capture a Shiny Darkrai, All You Have to do is just download the Action Replay software.
if you mean Pokemon gold then the answer is no and if you mean Pokemon haert gold then you can get him only with action replay