it is hidden somewhere in wellspring cave
You find Focus Blast in Wellspring Cave.
Its often on google images
Probably but you have to migrate it to diamond, pearl or platinum to find out.
You can find it as a TM in Steam Cave. I did.
Does chaos black version even exist? Yes
You can't, you can only find that on the white version. You can find Tornadous in Black.
trade
Focus Blast is in Wellspring Cave in both White and Black. Surf and Flash are needed to find it. More locations of powerful TMs: -Overheat is found on Route 11 -Stonedge is in Challengers Cave -Dreameater is in the Dream Yard -Fire Blast is in Icirrus city for 70,000P. This was answered by Nic (Friend code is 1893-0695-9791) For more Pokemon info, go to Serebii.net. (:
Trade it with people who have Pokemon White version as you cannot find wild Rufflet in Black
in your nose
There is a fanmade Pokemon Cursed Black version on cartrige, however there is a rom you can download (i can not find the website again, I will improve the answer when i do find it, sorry)
You can find it at Walmart, Target, and Game Stop.