What should I do after losing Ghetis's fight ?

[Zakiryo]

Hi guys, I have a problem with my Pokemon White/Black game...

 

After fighting Elite 4, N and Zekrom : I have lose my fight against Ghetis.

But now, I can't enter at Pokemon League (the guy in front of the League tells me "You can't enter").

 

So, how to return at N's castle for retry my fight ?

Thank you for your answers.

[Bearminator]

In the Poke Center left from Elite 4 entrance there will be NPC that will send you to N's castle- he will look like Plasma Grunt

[Zakiryo]

Just now, Bearminator said:

In the Poke Center left from Elite 4 entrance there will be NPC that will send you to N's castle- he will look like Plasma Grunt

Oh yes !

Thanks a lot ! I did not see him at first x)