unlock both sasuke

quote Des - FAQ

When play through the game you will see a of lot characters standing around
with gray Konoha symbols above their head. You can fight these npcs to get the
them for Versus Mode (if you haven't started with a savegame from a previous
game) and unlock assist characters. The list will show you where you can find
each of them. Not all Clones are there from the beginning, so if a special one
you're not there when you start just check back later after you finished some
other clones.

Note: 5 Clones cannot be found until you clear Sasukes part in Master Mode
along with going with Naruto through all the rooms. After that you can
find 4 new clones (marked with * behind the names in my list) near and
in Orochimarus Hideout. After you got those the final clone of the 4th
Hokage will stand on the Hokage Office in Konoha.