Sasuke sees Tobi when he fights Deidara. Tobi flees after Deidara self-detonates.
However, after he kills Itachi, Sasuke meets Tobi, who reveals himself as Madara Uchiha.
The Shipuden Episode is 139.
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He first meets Tobi when they are in pursuit of Sasuke, who is currently fighting Itachi. Tobi then goes to meet with Naruto when they are in the Land of Iron after failing to convince the Raikage to pursue to kill Sasuke.
in the series Tobi said he has known him forever...but in book 43 they meet face to face
Sasuke meets him in episode 115. In the manga he meets him at the end of chapter 346 and in 347 also.
Hope I helped :-P
Episode 117
sakura and sasuke do but at different times Pretty much all of them do
I'm not sure of when Naruto fights Tobi alone, but there is an episode in Shippuden in which he fights Tobi with a group of six or so shinobi whilst on a quest for Sasuke. This episode is number 134, called "Banquet Invitation".
He reveals it to Sasuke after Itachi dies. After Sasuke kills Itachi, Madara tells Sasuke about Itachi's hidden life. He also tells Sasuke who he is- Uchiha Madara! This is in Episode 140- fate.
He is first seen in chapter 35/episode 20.