The event has long since expired so you need to trade with someone who has Darkrai.
You can not get dark Pokemon on Pokemon diamond and pearl
NO!NO!NO!NO!NO!NO!NO!NO!NO!
You can't. There is no such thing in any legit version of Diamond or Pearl.
In Pokemon Diamond, I would say it is easy to find a Noctowl or Hoothoot after it becomes dark.
Firstly its Darkry not dark cry and secondly its a Pokemon obtained by hacking pearl or diamond.
i would have to say Dark Rai
=====================DARKRAI===========
Poochyena (sometimes wrongly spelled as Poocheanna) is a dark type of Pokemon. You can get one in Pokemon Diamond by breeding a Mightyena.
Darkrai is a dark type of Pokemon. You can catch one in Pokemon Diamond version on Newmoon Island but you need a membership card.
There's no such thing as dark balls.
fighting types and bug types are the most effective types on dark.
the moon stone.