You catch them with a ultra ball
In Pokemon Black Version the legendary is Reshiram and Pokemon White its Zerkrom.The only way to get both is to transfer Zerkrom to Pokemon Black Version or Reshiram to Pokemon White Version.
You can catch rayquaza
You have to defeat the elite four then you can catch the legendary
to catch zapdos in pokemon black you have to have every legendary pokemon
you can catch as many legendary Pokemon but only once unless you have it on the computer
you must die
Zekrom in Pokemon White and Resharim in Pokemon Black.
5
In Pokemon black you catch RESHIRAM and TORNADUS In Pokemon white you catch ZEKROM and THUNDERUS Sources : myself
Do you mean reshiram?if you do when you are on N's final battle in your first Pokemon league challenge,your light stone summons reshiram you have to catch it.
None
In black you can catch Reshiram and tornados. In white you can catch Zekrom and thunderos.