The only LEGIT way is through the event, And for previous answer; that's not Darkrai, it's Cresellia. You can glitch the game, but its not reccomended.
To do this, Beat the Elite four; then challenge them again. On the fourth door entrance (Correct me if im wrong) Use surf. It glitches the game and takes out the wall boundaries. You can simply "Surf" to the islands where you catch darkrai and shaymin.
Shaymin's island is adjacent to the Elite Four (North east). once there, use your explorer kit. Without moving, go back up.
Save, and then catch Shaymin.
I have no idea where darkrai's island is, Sorry. Darkrai's island is easy to get but with action replay ok go to Canalve city or whatever it is go to the guy to sail you to the island and use run through anything go ove the Mt. and Darkrai will be sitting in a little pond.
yes you can use action replay on Pokemon platinum
platinum get arceus this year from a Nintendo event, get someone to trade you one from a platinum game
when you get the membership pass with action replay,go to canalave city.Theres a house that you cant enter in it.then there will be a women that asks you to sleep.In your dream,you will go to an island and meet with Darkrai
no
The strongest Pokemon I met is a 100 lvl Magikarp in Resort Area(I call it King Magikarp :D )
You can't.
YoU can't, sorry
Glitch for it! On Google type in: Tweaking glitch for Pokemon Platinum. find out how to do it and then Type in: How to get darkrai using the tweaking glitch on platinum.
action replay
The only way to get a darkrai is for an event, i dont have one because i didn't have the game when it was on, you can get it without an event with action replay.
NO.All you can do is trade for one with someone who did use one.
Event for darkrai came out check pokemonplatinum.com for tips to getting it
You cant you have to buy action replay
get a darkrai from your friend[note if they want to trade)
You have to have an action replay to get to Darkrai.
You use the action replay, or get an event. The last way is the GTS.
you can not catch Darkrai in platinum you can only get it at special events or you can go to GTS and trade someone for it the last option is to get from a friend or use a master ball on a wild Darkrai or on someones caught Darkrai.