you beat ghetsis wich is n fathers name by getting pokemon level 70 or higher the best team to go with is latios black kyurem registeel salamence staraptor and genesect but remember level 70 or higher! i used level 90 i think thats the way to go if you want to beat him fast!
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If you mean battle him, you do that after you beat N in N's Castle.
In the dreamyard after you beat N and Ghetsis.
First of all you have to find N in N's Castle, a Zoroark will guide you there. You will battle N. When you beat him Zekrom will turn into the Dark Stone and you have to take it to Dragonspiral Tower. Catch Zekrom and then go to Giant Chasm. Kyurem will be there.
you get to see the credits and start a new adventure. [and use poketransfer]
You Get All T Gyms Badges And Challenge The Poke Leauge Beat N Aka Team Plasma and Ghetsis..Now Go MAKE ME PROUD