I found all 7 sages, so now what? pokemon white version?

ok, so I just found all the sages and looker came and told me that someone who looks like N is far away. I tried searching previous answers but I could not find what I wanted to know. Can I re battle N? if so then where? what do I do now? is the game over completely? it can't be, because it kinda leaves you hanging at this point if it does.