Question

Where I can get Zekrom in white 2?

Comments

I got it for trade with a heatran.

Answer 1

trade reshiram for zekrom

Comments

It's good idea, because I have 2 Reshirams

Answer 2

http://Pokemondb.net/pokebase/82926/can-i-have-both-kyurem-forms-in-just-one-version#a82930
Please read my answer on this question, just ignore the Kyurem bit.
You need to trade Zekrom from Black 2
But follow the steps to get Reshiram