I dont think you can even though you get the adament orb,the lustrous orb,and the griseous orb from the shadow triad on marvelous bridge.
You can't catch Dialga in Pokemon Black. You need to trade for it or transfer it from the older Pokemon DS games.
Sorry, you can't catch dialga in Pokemon black. You need to trade with a friend from an earlier game.
Dialga cannot be found in Pokémon Black.
You can't.
you have to transfer from diamond, pearl, or platinum or trade with a friend
You canot a dialga egg in pokemon black and white.
You have to transfer it from another game.
Dialga needs to be traded in from Diamond, Pearl, Platinum, Heartgold or Soulsilver.
You'll have to trade for it or transfer it from the older Pokemon DS games.
Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
You can't catch those Pokemon on Pokemon Black. You'll have to either trade for them or transfer them from a DS Series game.
not, trade it from a 4th gen game or use hacks.