In Pokemon Black you can actually get quite a bit of legendaries.
You can Get Reshiram, Kyuram, Giratina, and Arceus.
Also Kyogre and Groudon.
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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.
You don't need them for the storyline, you get them so your pokemon can hold them and raise their stats.
Try to not use legendaries, it will show that you can be strong without them!
Zekrom can be found in "Pokémon Black" as a Pokémon that N uses but there is no way for Zekrom to be caught in "Pokémon Black."Zekrom cannot be caught in Pokemon Black and has to be either obtained from an event or traded from a copy of Pokemon White.
sorry no you cant yes you can the first is in N's castle and the other in a cave