Does this mean how do you get to him, or how do you catch him like you're having trouble battling him?
To get to him, just beat the elite four, then go into N's castle and and go to the top floor and you will watch a short clip and you can battle him.
Fortunately, Nintendo had some mercy and made Zekrom/Reshiram easier to catch, because they didn't want people to be frustrated by being required to catch a legendary. Don't bother using your master ball on one of these two. As soon as I got in battle, I used a quick ball and he was caught. It's that easy! Just keep tapping A when they are in the ball.
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Kyruem is pretty hard to catch unless you didn't use your Master ball to catch Zekrom, I caught Zekrom with a Quick ball.
No you can't. You can catch zekrom in Pokemon white and reshiram in Pokemon black.
No, it is a one time only pokemon.
Beat the Elite Four and then you talk to N and Zekrom comes out of the Dark Stone. You have to catch it to battle N, so bring lots of Ultra Balls! After you catch it, you have to fight N and Ghetsis.
Yes you can catch Reshiram in Pokemon black and you can catch zekrom in Pokemon white hope it helped.