No. You cannot get Darkrai in SSBB, even with hacking.
He isn't in there
You can't
You cannot get Darkrai as a playable character nor be in a pokeball in Super Smash Bros Brawl.
It is impossible to get Darkrai in SSBB. He does not make any appearances in the game at any cutscenes, as a character, or even out of a Pokeball. You cannot hack to get Darkrai. How long have you had the game? He is a TROPHY.
Sonic is in SSBB.
You can't get tails in SSBB.
rosalina is not a character in ssbb
he is not a playable character in ssbb
There are no looney tunes characters on SSBB.
no you cant SSBB is only WII
This character doesn't exist in ssbb.
he's not a character in ssbb so you can't get him