If you are looking for the specific episode breakdown, here is everything you need to know about where this arc begins, peaks, and ends. The Short Answer: Which Episode is the Pain Arc?
It spans the heart of Naruto Shippuden , beginning roughly around ( "News" ) and reaching its devastating climax near episode 169 ( "Two Students" ). But the true battle—the one that would break Konoha and remake its hero—burns from episode 157 ( "Assault on the Leaf!" ) onward. which episode is pain arc
This is the core of the arc. It begins with the Six Paths of Pain invading the Hidden Leaf Village. If you are looking for the specific episode