In Pokemon Platinum you must go to a Nintendo event to get the item: Members Pass the item will let you go to New Moon Island where you can fight Darkrai he is lvl. 50.
And guess what there is a glitch in the Japanease Version where players don't need the members pass, but Nintendo fixed it for the American Version.
you hack
Darkrai
No.
Nope
action replay
Darkrai.
Ok the answer is yes, but only throught the darkrai event
Darkrai is a Pokemon from Generation IV, and Pokemon ruby is a game from Generation III , so you can only get darkrai in Pokemon Platinum, Diamond or Pearl
You dont catch Darkrai in Pokemon Pearl. You can catch it in Pokemon Platinum at level 40.
No you don't have to.
In harbor inn
with a special event
You need an event.