The seven sages are found in: N's Castle, Route 18, route 14, Chargestone cave, cold storage, dreamyard and Relic castle.
its near where you find the 7th sage
The sage is located in Undella Town. To get to it, you need to go to the water and go up the waterfall.
Ghetsis should be in front of Black City for Pokemon Black.
He just comes to capture him.
You walk up and down route 14 and after a couple of minutes, you'll find sage.
In Pokemon Black/White Versions there is only Six Plazma Sages To Discover
His Pokemon are: Vanillish,Cryogonal,And Beartic.
Bennett White goes by Bennett the Sage, and The Sage.
White sage is called "ವೈಟ್ ಸೇಜ್" (vait sej) in Kannada.
someone gives it to you late in the game. after the 7th Pokemon battle
You just have to find them. Sage 1 - Dreamyard, in a previously inaccessible area, Sage 2 - Relic Castle, Sage 3 - Chargestone Cave, third level, Sage 4 - Cold Storage, inside a container, Sage 5 - Route 17, on the westernmost island, Sage 6 - Route 14, you need 'Waterfall' to reach him, Ghetsis - Captured at the end of the main plot, but escaped and can't be found (until Pokemon Grey, perhaps).
You should go to Dragonspiral Tower, which is north of the Pokemon Center in Iccirus City.