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".
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naruto shippuden epidode 113
Hinata fights the Pains in episode 166 of Naruto Shippuden! it is alos the episode where she confesses her love to Naruto.
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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.
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