Dialga, Regigigas(must have transported all 3 regis from a different game), and Giratina. Also Heatran on stark mountain, The three lake pokemon- azelf, uxie and mesprit (in their respective lakes) ,Cresselia appears on Fullmoon Island and makes you run around Sinnoh to catch it. And if you count Lucario as a legendary, you get a riolu egg when you go to iron island.
in diamond, you can get dialga, mespirit, uxie, azelf, giratina. you could get arceus, darkrai, cresselia, and shaymin through Pokemon events but they passed already
the legendary in diamond are dialga, azelf, mesprit and usie.
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.