Go to Route 6 and fish in rippling water.
Yes, you can get Politoed in Pokémon Black 2, you will be able to find wild Politoed in Routes 6, 19 and 20 and you can also find it in the Floccesy Ranch, the Lostlorn Forest, the Victory Road and the Clay Tunnel.
Yes. You find zekrom in Pokemon white and the white Pokemon in Pokemon black.
You cannot find Celebi in-game in Pokemon Black and White. You must get it from the Pokemon Black and White Tour.
Nowhere. you can find the Black city in pokemon black and White forest in pokemon white. YOu can't got to the white forest in pokemon black
Virizion is for pokemon black. You can find Cobalion in white.
You can't find a buneary in pokemon black and white.
You can't find a snowrunt in pokemon black and white.
At the white forest. You can only find him in pokemon white.(I think);)
You cannot find Vullaby in Pokemon White Version. It is exclusive to Pokemon Black as Rufflet is to Pokemon White.
Gheisis is in the Black City if Pokemon black, or White forest in Pokemon white. In Black he is dressed normally, without the robe or the staff.
White forest is only in pokemon white.
You can only find a Magma Stone in Pokemon Black 2, White 2, Pokemon Diamond, Pearl, and Platinum. It is not available in Pokemon Black and White.