Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
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NO!!!!! YOU CAN ONLY CATCH PALKIA ON PEARL you can't catch dialga on Pokemon pearl but you CAN trade it you only get both in Pokemon platinum
You can catch Palkia in Pearl and tranfer Dialga to pearl from diamond.
IN spear pillar on Pokemon platinum In diamond u can only catch Dialga and in Pearl u can only catch Palkia! hope i helped
you catch palkia/dialga
You catch dialga/palkia on spear pillar inside of Mt. Coronet for diamond or pearl