Simply You Cant
It was probably Pokemon Blue Rescue team
No
you can't i think i have completed the game but i think it can't
you can't he's not in this game
You'll get it after you beat the game.
Pokemon Red Rescue Team is a GBA game pak, while Pokemon Blue Rescue Team is a DS game card. You can only play Red Rescue Team with a Gameboy Advanced (GBA) or Gameboy Advanced Special (GBA SP), but you can play both games with a DS.
Darkrai is not available in Pokemon Mystery Dungeon: Blue Rescue Team, because Darkrai is a Generation IV Pokemon, and Blue Rescue Team only has Pokemon from Generations I-III (except for Bonsly, Weavile, Mime Jr., and Lucario, who only appear in the game as statues).
you have to beat the game first
There is no cheats in this game
by beating the game
Restart the game and play it with a different team.
No. Discharge is a fourth generation move, while Pokemon Blue Rescue Team is a third generation game.