Yes you can, but the only legit way is to complete the main game and post game storyline entirely, then find, battle and recruit Darkrai in the places he shows up in, and use him as team leader for further exploration.
No wonder mail code can give you access to Darkrai.
beet darkrai
yes you must have it or darkrai will not show up
you have to beat darkrai then wait afew days
Sorry to burst your bubble but, there are only darkrai events in Pokemon Diamond, Pearl and Platinum. if you have any more questions email me at dinobird2000@yahoo.com
Yes Darkrai is in both games if I'm not mistaken. He was responsible for the whack in time and the spread of darkness. Your final confrontation with him is in the dark crater.
evolve your main characters and try to "join 'em all"
Darkrai will be Level 53
Well i had to do it 5 times because Cresselia always got beaten.He is strong but if you are on a high level(at least 60-70) you shouldn't have much trouble.
U find Darkrai in Dark Crater.
If you choose the answer '..........' when Darkrai asks you to join his world of darkness, Your Partner will scream to you telling you it's a nightmare and you smack Darkrai Just like if You Refused to Join His Army Hope This Helped =)
defeat darkrai mission
I believe you can evolve your team members.