Gutsy Master and Student: The Training

is episode 187 of the Naruto: Shippūden anime.

Summary
Naruto and Jiraiya have left Konoha to begin their three year journey. As they walk, they talk about Naruto's need to overcome Sasuke Uchiha's Sharingan which has the ability to force a ninja under genjutsu. Jiraiya summons Gamariki to place Naruto inside Genjutsu Kiss to practice breaking out of genjutsu techniques. Naruto tries to disrupt his inner chakra flow, but instead, creates a wave of chakra around him thus hitting Gamariki in the physical world. Jiraiya decides Naruto is not ready to try and break out of genjutsu techniques. Thus, they leave to Village hidden in Genjutsu Trees to train there, because it has natural genjutsu affinity. Jiraiya realizes something is wrong in the once benevolent village as a villager he once knew acts hostile toward them and asks them to leave. Jiraiya and Naruto find out that Kandachi has come there to hide from Amegakure pursuit and has taken over as a violent dictator.