Where can you find...

You can find groudon, kyogre, articuno, rayquaza , Mew, giratina , heatran in special mission it's a wonder mail code for those pokemon.... So thats all I really know

Hope it helps

You can find and catch 7 different legendaries by using Wondermail Codes to unlock certain dungeons where each are located. But, I suggest you use Serebii's Spinoff Pokedex DP to find out where the rest of the legendary Pokemon are at.

I hope this helps,
Sk8rboy

IN GAME RARE POKEMON
Dialga at the temporal pinnacle
Palkia at sky rifft bottem
Regice,regirock,registell and regigigas at aegis cave
Uxie steam cave peak
Mespirt under ground lake

Groudon kyogre and articuno can be found in wonder mail latios and latas can both be found in spacial rift and and one of them can also be found in happy outlook and the other in midnight forest (need wondermail to get both of thouse dungons) jirachi and moltris cand be found in final maze florr 23 for jirachi but he is very hard to get floor 40 for moltrace but I got him the first time and zapdoze is found at amp plains floor 7 PS zapdos jarichi moltrace latios and latias all recuier you to have the mystery part or secrect slab in your bag

I know Jirachi, Moltrez, and Celibi can be found in the last maze of the dojo.

ARTICUNO - Mt. Avalanche Peak
ZAPDOS - Amp Plains 7F
MOLTRES - Final Maze B40F
MEW - Deep Mystery Jungle
RAIKOU - Concealed Ruins B20F
SUICUNE - Final Maze B29F
LUGIA - Surrounded Sea B18F
HO-OH - Mt. Mistral 19F
CELEBI - Mystifying Forest 10F
REGIROCK - AC, Regirock's Room
REGICE - AC, Regice's Room
REGISTEEL - AC, Registeel's Room
LATIAS - Spacial Rift 10F
LATIOS - Deep Spacial Rift B5F
KYOGRE - Bottomless Sea Depths
GROUDON - Shimmering Desert Int
RAYQUAZA - Sky Stairs Apex
JIRACHI - Final Maze B23F
DEOXYS - Shimmer Hill 17F
UXIE - Steam Cave Summit
MESPRIT - Quicksand Cave Lake
AZELF - Crystal Crossing Lake
DIALGA - Temporal Tower Summit
PALKIA - Spacial Rift Bottom
HEATRAN - Giant Volcano Summit
REGIGIGAS - AC, Regigigas' Room
GIRATINA - World Abyss Pit
CRESSELIA - Sharpedo Bluff
PHIONE - Miracle Sea Bottom
MANAPHY - Sharpedo Bluff
DARKRAI - Miracle Sea B3F

I know where all of them are but to make it short, just go to www.youtube.com and type in Pokemon mystery dungeon explorers of darkness legendries and click on the first video. It shows you every legendary Pokemon, what dungeon they are in, what floor they are on, and what items you need to get them. Hope I helped. -SonicSpeed32