In the Pokemon League in the Champions room.
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When you reach N's castle, Zekrom will confront you after Reshiram has appeared.
Yes, you can get Zekrom from "N's Castle" and in black you get Reshiram instead.
It will turn into Zekrom when you team plasma N's castle and talk to N.
sorry no you cant yes you can the first is in N's castle and the other in a cave
u have 2 finish the elite 4. then u get 2 n's castle and first u catch Zekrom then u fight n.