well, since Pokemon platinum is like Pokemon dp, i believe u have to link up up with 4 other friends on mystery gift and u get a key. Then u go to Canalave city and go to up to the farthest house. you should be able to unlock the door. i think theres a man there and he wants u to go to sleep. then u wake up on darkrais island.
you use an action replay
You would have to get an action replay.
you need either the event or an action replay.
an event from a Pokemon movie like the manaphy event was from Pokemon ranger temple of the sea. the Darkria event from Pokemon rise of Darkria should be out soon PS.from Pokemon rise of Darkria if you get that event you will get the membership card so you will be able to go to new moon ialand were Darkria LV40 lives.
i think there is about 12 plus regigigass and manaphy and phione and also if you concider rotom to be a legendary and if you have an AR YOU CAN GET ARCEUS DARKRIA AND SHAMIEN AT THE SPECIAL EVENT.
You have to download a special event.
you can only get darkria in Pokemon platinium if you get the wonder card that was a Pokemon event last year.
you can only get a Darkria by either AR or by the Pokemon event srry people*-*
with a special event
Arceus is a special event pokemon. The only way to get it is to get it at a special event or to hack the game.
trade with Pokemon Platinum
you have to download them at a Nintendo event