You can't....
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.
you need a chip not a code
pokemon white is hareder than pokemon black
Pokemon Black Version & Pokemon White Version.
yes the japenese version is compatible with the English version.
Pokemon white reshiram is on black
zekrom is the main Pokemon of white version and rashiram is to the black version.
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.
There is no such Pokemon as Mewthree.
You can't catch Garitina on Pokemon White.
There are 26 legendary Pokemon in Pokemon black/white version.
You have to trade it from someone who has Pokemon White. It is a version exclusive pokemon, exclusive to that version.