When you defeat N then he releases his legendary pokemon. Then, after the credit-roll, an epilogue movie plays in which Zekrom/Reshiram, with N on top, hovers above the clouds and, activating its tail's engine, accelerates away.After the player finds the other six Sages for Looker, Looker says that he has heard that N was seen in a distant land with a Dragon-type Pokémon.
Source:Bulbapedia
In my opinion, I think that the player will meet N in Black and White 2 .
