Ghestis disappeared after you battled him and N at the Pokemon League.
Ghetsis will be in front of Black City if you are using Pokemon Black, and White Forest if you are using Pokemon White.
yes you can he should be at black city or the pokemon league or white forest
Well you could go to white forest on white and find ghetsis on black go to front of black city
That is not really a question to ask but if you asked who is ghetsis he is one of the seven sages in Pokemon black and white.
no one knows
The same as Pokemon black.
You don't. They debut in Pokemon Black and White.
In the dreamyard after you beat N and Ghetsis.
Have at least level 56 Pokemon, and make sure they are good.
After you beat Ghatsis on Black or White, you cannot find him again.
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.
You will fight Ghetsis after you beat N