Route 14, route 18, the dreamyard, relic castle, the cold storage, and the charge stone cave
go to www.pokemon Black & White-New pokemon.com to find out.
At black city but it's hidden somewhere therE
he only is in Pokemon platinum and Pokemon black and white in Pokemon platinum you see him in jubilife city, and I think maybe at Team Galactic HQ. in Pokemon black and white after you beat the elite four, he is looking for the seven sages. after you find all seven sages he'll talk to you and he'll arrest the 7 sages. you will never see him again after that.
Nothing that's it
Just enjoy Pokemon black and white! catch your favorite Pokemon, do global trades/battles or battle your friends! Have fun!
catch "em all
yes you have to find all of the seven to catch rayquaza in pokemon white
nothing.
look for n
Sadly after months (minutes :D ) of research, I have finally accepted that Ghetsis cannot be found even after you find all the sages in Pokemon Black/White. There are rumours though that he has been spotted near Black City/White Forest, depending on which game you have.
Unfortunately, nothing happens.
you can't