Depending on which series you are watching, "Episode 156" refers to different events. Here are the summaries for the original series, Shippūden , and Boruto :
After struggling with toad oil, Naruto learns to channel natural energy through intense focus. He uses Shadow Clones to accelerate his learning, a feat even Jiraiya couldn't achieve. Naruto Episode 156
This is a filler episode from the Kurosuki Family Removal Mission arc. Depending on which series you are watching, "Episode
Tenten is defeated by Raiga but later saves Ranmaru. Naruto, Neji, and Rock Lee struggle against Raiga’s lightning-boosted powers until help arrives. Naruto Episode 156