Do you mean Volotos? You can't catch it on Pokemon Black, since it can only be found on Pokemon White.
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Yes, but you need Thunderous and Tornadous.
get thunderous and tornadus and go to his shrine. he then will come out level 70 so be prepared
Thunderus: by trading, yes. not in the wild. Landorus: bring Tornadus and Thunderus to the Abundant shrine on route 14 to encounter it.
You can catch the main white legendary, Kyrugem, Virizion, Cobalion, Terrakion, Thunderous, Victini, Zorua, Zoroark, Volcarona, and Landorus.
you cant really catch him you must trade him from black/white. hope this helps!