You get him in shimmering hill floor 17 with secret slab. However he is very hard to recruit
Go to Shimmer Desert floor 20 and you can meet Deoxys(You must bring a Secret Slab.)
Zapdos, Raikou, Entei, Lugia, Ho-oh, Celebi, Latias, Latios, Deoxys, Darkrai. To find out where, visit www.serebii.net/dungeon2/legendary.shtml.
to get to deoxys,you need to get to some mountain and chase him around 4 meteors.
on your D's turn the time on the date and day the mystery gift was on and make sure you also have a R4C Chip and then just the game then you'll see mystery gift but this will only work if you've used mystery gift before
shimmer hill 18f you need mystery part and or secret slab
the first two mystery dungeons-blue and red rescue teams have up to deoxys, meaning every Pokemon from red version to emerald the next three games-time, darkness, and sky have up to arceus, every Pokemon made so far as of Pokemon platinum. Although I think some legendaries are only in sky
The Pokemon not in Pokemon mystery dungeon time are Mewtwo, Burmy, Buneary, Lopunny, and Rotom.
Pokemon mystery dungeon explorers of time.
either Pokemon event which passed a long time ago or by trading
Deoxys is in Shimmer Hill (17F), but you need a Secret Slab or Mystery Part.
Pokemon cannot be traded in the Mystery Dungeon series.
No because Oshawott was created after Pokemon Mystery Dungeon.