you can't
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Transfer it from your bottom game or get it from a Pokemon event. Pokemon events are under Wifi Conection but they don't happen often.
Through an event, wifi or a specific area, which is announced by Nintendo. There currently is no way to get a Darkrai without an action replay.
You cant open the door.unless you have the Members pass which allows you to get Darkrai. and you can gat the pass only by a wifi event. hope this helps :)
Darkrai, totally!
You get Darkrai by trading in SoulSilver.