After finding the 6 Sages(Ghetsis and N must be in Sinnoh), you go onto your adventure,completeing the PokeDex.
Where? I dont know! I really dot know! Tell me if you find out!
I don't believe you ever go anywhere. The hidden sages will all give you TM's, but that's pretty much it.
Go find the seven sages the first on is in the dreamyard go through the underground passage to find him
Not too much, go to White Forrest, catch all the pokemon. There is not any other story lines that I'm aware of
Well you could go to white forest on white and find ghetsis on black go to front of black city
if you mean on Zelda Ocarina of Time, then go to Ganondorf's castle
you go to nuvema town to your house and talk to looker
Looker went asking the seven sages about their plan and after that he went back to sinoh to do some resreach. He will come back after you get all the 3 legendry pokemon Virzion, terrakion, and cobloin. he will blab something about your legendry pokemon and after that i dont know.
The seven sages looker will come and tell you that 'N is far away but where is he and where is the Pokemon genesect" well Genesect is a distribution Pokemon so i would guess that by getting the special distribution Pokemon will lead you to N or at least allow you to then continue to look in "newer places" but that's all i know
when you go round the corner find a little Pokemon that will give you the key to a small gate unlock it and you will find a sage
Once you have found the Seven Sages the looker will tell you that he saw N but he let him go. You can not find N in the actual game play.
The place works like Turnback Cave, which appeared in Pokemon Diamond, Pearl and Platinum versions. At the end, you will find one of the seven sages and he tells you that he wanted to give a Volcarona to Ghetsis but he says you can have it. Then, go into the next room and catch a LV 70 Volcarona