If you mean that episode where Sasuke is just recovered and in hospital, it's episode 107. Sasuke challenges Naruto and they fight in the roof of the hospital, while Sakura screaming helplessly.
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that episode does not exist
episode 203
episode 115
an episode called the end he fights his bro
This fight between Danzo and Sasuke happens in Naruto Shippuden Episode 209: Danzo's Right Arm. More information about Itachi comes out in this episode as well.