Naruto taught Konohamaru the Rasengan. Naruto said: "It's time i passed things down onto others." Maybe because the Sarutobi is Wind-Natured and because Konohamaru is like a brother to Naruto. Also remembering Naruto promised to fight Konohamaru for the title of Hokage, Naruto wanted him to get stronger.
Sometime during Season 1 - 3
In the anime, it's a flashback in episode 161. Naruto teaching Konohamaru the rasengan was actually done off screen. In the flashback, Naruto is describing the rasengan to Konohamaru, who thinks he's about to teach him another sexy jutsu. Hope that helps.
Naruto teaching Konohamaru Rasengon was never seen on-panel or on-screen.
Naruto meets Sai right after returning from his mission to save Gaara. In the manga that would be book 32.
Naruto Shippuden episode 15
Yes, actually. Kakashi demonstrates, to Naruto's complete surprise and amazement, the use of the Rasengan during training for the RasenShuriken. Hope this helps!
Yes, The hokage place was actually for Naruto but Naruto gave it to Konohamaru ( 7th Hokage )
naruto strongest rasengan is massive rasengan and nine tail fox rasen shuriken by:hao to
Nine tails [Kyuubi] Rasengan or the Vermillion Rasengan
I really don't know but Kakashi uses the rasengan against and Ikatski member but not killing him. Then later the Ikatski member never played a part in any other Naruto series. But then he appears in the Naruto: Shippuden series much stronger He uses the Chidori but eventually not killing him he uses the rasengan and eventually kills him when he makes fun of his Father (The White Fang)
When you have little healts and use normal rasengan red rasengan (nine tailed fox rasengan) must appears
sasuke is a member of the Uciha clan and the Sharringan is in his blood line. he learns it on his own.