Of course you can
2nd answer: the only nonunova legendaries you can catch are heatran, latias (white 2), and latios (black 2). You need to make black kyurem (black 2) but white kyurem (white 2) can't be traded. However, if you don't have black kyurem, you can make white kyruem, but only if you've caught kyruem.
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Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
can you TRADE for a pansear on POKEMON WHITE 2!
Darkrai cannot be found in Black 2. (Or Any of the BW, BW2 games). You need to either transfer from a previous generation that has Darkrai or ask a friend.
no. get it from a trade or another game then trade the pokemon from that game to pokemon black version2
not, you need to use poke-transfer to get one.