You must beat the game, then befriend it. Much better info is found here..
http://serebii.net/dungeon2/legendary.shtml
Legendary Pokemon are usually found at the top of dungeons like rayquaza and kyogre. Most do not join you the first time you visit them.
I have Pokemon dungeon explores of darkness but if I were you, I would battle legendary Pokemon twice to get them in your team.
There is codes to unlock THEIR places not to recruit em
keep training, all legendary Pokemon fall in time
you can start out with it
Some legendary Pokemon found in Pokemon Mystery Dungeon: Explorers of Time include Dialga, Regigigas, Azelf, Mesprit, and Uxie.
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At End Lake.
Play the game.
there is no legendary. The Pokemon in it just change every time you trade someone.
Yes at Luminus Spring
it depends on what you answer to the questions