you cant, but you catch dialga in diamond at spear pillar, palkia in pearl in spear pillar (note there is a pokeball behind eaach one that is their orb), the lake trio in the cavern in the middle of each lake, giratina in turn back cave whick u can only get to if u get the national dex, heatran in stark mountain where u can only go if u have th national dex, regigigas in the temple in snowpoint city ( have to beat Elite4+Cynthia), cresselia in fullmoon island(have to have national dex then go to the sailors house), I think i covered all of them but if not go to
http://www.serebii.net/diamondpearl/legendaries.shtml
there is NO lord volroc is Pokemon diamond or pear or anywhere
mainly its your rival inpokemon platinum but Cynthia on Pokemon diamond and pearl
you have to release all your ledgendary Pokemon then use poke rader at route 229
I dont think you can. You will have to trade it from a Pokemon Diamond/ Pearl/ Platinum game which has Arceus.
There is no TM that contains Mean Look inpokemon diamond. You need a Golbat if you want mean look
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
you cant unfourtanately
Dialga
arceus