you can't
The legendaries in Pokemon pearl are Palkia, Regigigas, Giratina, Cresselia and Heatran.
pearl
the new Pokemon are the legendaries Giratina,Darkrai,and Arceus.
go to this page http://www.serebii.net/diamondpearl/legendaries.shtml this page has all the legendaries you can normally catch in in Pokemon diamond/pearl all other legendaries you have to transfer from a 3rd generation game
The legendaries in Pokemon diamond or pearl.
their are 12 new ones but Lucario is not included because it is not a legendary because it can breed and it evolves. There are 493 Pokemon (counting the mystery gift Pokemon) in all and only 34 legendaries in the national pokedex
In Diamond/Pearl you can capture 8 legendaries. You can get more legendaries through events, trades or migrates. You can find 7 legendaries in both Diamond and Pearl: Cresselia, Giratina, Regigigas, Heatran, Uxie, Mesprit and Azelf. Dialga is exclusive for Diamond and Palkia for Pearl.
All except for Garitinia and all from Pokemon black and white.
The lakes, Spring Path, Stark Mountain, Full Moon Island, New Moon Island, etc.
g;r;g;g
You have to free the 3 legendaries.