U go 2 Sky Stairway(1-50F) or Spatial Rift and Deep Spatial Rift
You may recruit Pichu on floors 3-6 of the Joyous Tower dungeon.
You automatically get it when you recruit Groudon, from Magma Cavern - Pit. :3
You can in Mystery Dungeon Blue and Red. You can get Articuno in Time and Darkness too, if you use wonder mail. From N.S.
Regigigas isnt in mystery dungeon 1. In the other mystery dungeon games, go BACK to aegis cave and then recruit him! in pearl and platinum, you need all of the 3 regis in your party and then catch him!
western cave on floors 3 thru 6..you must the hm SURF to enter..VERONICA
If you are talking about Pokemon mystery dungeon red rescue team or Pokemon mystery dungeon blue rescue team then: Talk to alakazam, he'll mention something about the 3 great birds. once you go to them they will give you a stone which allows you into a new dungeon which has lugia.
Mystery Dungeon 3 isn't out yet. And no, they won't work.
Yes you can. He is located in bottomless sea. (Note you will have to go through 49 Floors not including the room Kyogre is!) It personally took me 3 tries to recruit it.
You can get Lugia if you have a mystery part or a secret slab at the Surrounded Seas (I think 9th floor. I don't know for sure.)or if you are playing red rescue team or blue then recruit the 3 birds zaptose articUNO and moltres
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To get legendary island go to articuno,zapdos or moltres and recruit either one of them. you can recruit them one by one. just walk in circles in the battle field at least 3 times. You can recruit other legendary Pokemon by doing the same thing. Once you recruit zapdos ,articuno or moltres you will automaticly get the friend area legendary island.
arceus isn't in Pokemon mystery dungeon 2. he is maybe in Pokemon mystery dungeon 3.