When does he get this ability? Note: I got the basic idea for this from a Ranma 1/2 storyline on Unending Be called Taken Red, if you want to check it out.
In choice four, a one-use scroll for the ability was found in the Forest of Death by the snake that swallowed Naruto, and it stored it inside of it, hoping to please Orochimaru, but Naruto took it when he killed the snake from the inside by blowing it up with his Shadow Clones.