How to find ghetsis after locating the 6 other sages in pokemon white version? ~*KLT&RLT*~
In Pokemon White, after you find the six sages at N's Castle you have to capture Reshiram.
Next you fight N, and then Ghetsis will appear. After you defeat Ghetsis in battle, he is taken away by Cheren and Alder.
Ghetsis does escape from Cheren and leaves the three orbs behind.
Ghetsis will be back in Pokemon Black 2 and Pokemon White 2, coming on October 7, 2012.