Tornadus, Landorous, Reshiram, Virizion, Terrakion, Cobalion, Kyurem, and Victini
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none
I put a link to guide on all the legendary pokemon in Pokemon Black in the related links.
catch them
you dont catch it.you shoud have an action replay to catch it or an other pokemon game to sent it from there to there.i prefer the pokemon ss or hg where u can catch almost all legendaries
You can catch legendaries in any Pokemon game! (At least after you know where they're hiding!)
You can catch Zekrom in Pokemon White and Reshiram in Pokemon Black. They are version exclusive legendaries so the only ways you could get both is through hacks or trading with someone.
go to this page http://www.serebii.net/diamondpearl/legendaries.shtml this page has all the legendaries you can normally catch in in Pokemon diamond/pearl all other legendaries you have to transfer from a 3rd generation game
arceus
In Pokemon Black you can actually get quite a bit of legendaries. You can Get Reshiram, Kyuram, Giratina, and Arceus. Also Kyogre and Groudon.
I beileve that if it is like most other legendaries, you only have ONE (1) chance to catch it, If you killed it, too bad. Try trading for it.
Not including the legendaries and special pokemon ( ones that you can only catch once ) feebas is the hardest and rarest pokemon to catch
Pokemon Platinum because you can catch more legendaries!