Question

i just beat ghetsis and I want to know when you catch zekrom

Comments

Zekrom is only in Black 2 im assuming thats what you meant

Answer 1

You must first beat N and he will give you the stone of his Pokemon. You can then take it to dragonspiral tower and catch his Pokemon depending on the game.

White 2:Reshiram
Black 2:Zekrom

Source

Comments

thanks and yes i meant black 2

Answer 2

You can't get Zekrom in White2 you can get it in Black2

Go to where the Zorark was standing and you will find N's Castle from there N will guide you.