All legendaries can't breed, even the ones that have genders like Heatran.
there is going to be an event for diamond and pearl at your local game stop on these folliwing dates:20-22and27-29
Paulkia, Uxie, Mesprit, Azelf Rotom, Manaphy*(AFTER Elite Four) Heatran, Regigigas, Giratina, Cresselia, Shyman*, Darkrai**Are only available through Nintendo WiFi events/Beating Pokemon Ranger games and transfering them in.
You can't just search it on some pokemon event websites (it's normally in february or January
It just ended and to look up events you have to go to pokemon.com or serebii.net.
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.
you can't
pearl
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 pearl are Palkia, Regigigas, Giratina, Cresselia and Heatran.
Darkrai, Arceus, Cresselia all need their own separate events from either a Nintendo Pokemon game (non handheld) or an Action Replay.
g;r;g;g
All legendaries can't breed, even the ones that have genders like Heatran.
You have to free the 3 legendaries.
Catch legendaries, get eevee, make a good team.
Mesprit Azelf Uxie Palkia
The legendaries in Pokemon diamond or pearl.