episode 58
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Wind
Kakashi reveals that the Rasengan is an incomplete jutsu as he is not able to combine his own elemental chakra affinity into it, just as it's creator, the Fourth Hokage couldn't do. He then presumes that Naruto might be the first one to be able to do so. Kakashi reminds Narutothat creating a technique requires combining nature transformation with shape transformation. By completing hisWind Release training he has the former, and since he can already perform the Rasengan he has the latter. Naruto concludes that creating a new technique will be easy since he has already mastered both components, but Kakashi corrects him by showing that he can also use the Rasengan. Combining nature transformation with the Rasengan was too difficult for Kakashi and the Rasengan's creator, the Fourth Hokage. Kakashi is confident that Naruto will succeed where they failed. naruto shippuden #75+76
Yes. It evolves into Grotle in DP Episode 100, and evolves again, into Torterra, in DP Episode 166.
As far as I can Remember it is in Nature Pants when he moves into jellyfish fields with the jellyfish.
I guess you are refering to Sage mode. Sage or Hermit mode is when someone trained in senjutsu has made Sage chakra (normal chakra mixed with energy from the nature). In sage mode, ninjutsu, genjutsu and taijutsu are stronger, the user becomes stronger and a lot of things. Follow the link for more info.