After you have beaten 7 of the gym leaders then you must go through lots of rugged paths through Mt. Cournet. Then you will battle Cyrus and then you will battle dialga.After you have relised the lake Pokemon from veilstonse Galactic Building then After you battle dialga two.Then use surf around the lakes and then go in the cave and battle them.Save your masterball for mesprit.Mesprit travels from place to place so be prepared to battle her.After getting full pokedex and beating elite four,if you want please go to the hidden fourth lake and go through 30 paths through the cave.Then you will meet Giratina. In pearl you will find palkia instead of dialga .Platnium versojn is better. But I lost my diamond version. And I had a freakin MAgikarp that knew roar of time,spacial rend, judjement,and shadow fore. he had a lot of high stats.Get an action replay if you need a lot of help.Your help from.Sincerly Morgan Max Comnley
the legendary Pokemon in diamond and pearl are dialga and palkia.
No, a Bidoof cannot evolve into any Legendary Pokémon in Diamond.
Heatran
a lot of legendary Pokemon
Dialga
you cant unfourtanately
arceus
you can't catch it because you already beaten the legendary
no
you can't unless you have AR
Empoleon is not a legendary Pokemon. It is the final evolution of Piplup, one of the starter Pokemon in Pokemon Diamond, Pearl, and Platinum.
That would have to be Dialga.