No. Believe it or not, Sawk and Throh aren't version-exclusive. They're just rarer in the corresponding game(Sawk in White and Throh in Black).
From what I know of there is just throh and sawk. You can find throh in rustling grass in Black and Sawk in rustling grass in white. There is a ledgedary trio though
You can catch Sawk at pinwheel forest, before you enter it (where the challenge rock is and all). I believe the encounter rate is pretty low, as I took a while to find one
Sawk does not evolve, nor does it evolve from anything.
Pokemon black
Sawk is found in shaking grasses on routes where throh can be found normally in white and in black throh is found at the same way.
Sawk is a Fighting type pokemon.
Sawk does not evolve.
Is sawk a legendary pokemon??
Sawk.
You can find Sawk in Pokémon White in the small Route before Pinwheel Forest which is after Nacrene City. It will be available in the shaking grass. You can also find Sawk in Routes 10, 15 and 18.
Throh doesn'y evolve into Sawk,and Sawk doesn't evolve into Throh.They are however,oddly similar.
Sawk learn counter at a level 18.Sawk learn low sweep at a level 16