How can Naruto breathe on the moon? In The Last: Naruto the Movie, Naruto's fight with Toneri is set on the moon. 

But how can he breathe on the moon? Is that because of some technique, or something else?
In short
According to wiki:

The exterior of the Moon is barren, covered with craters and canyons.
It has a weak gravity, but is still able to maintain a breathable
atmosphere
.

Since it has breathable atmosphere, so that's why Naruto didn't used any technique or something else. Which conclude that the Moon from shinobi world is far more different than the real moon which we know.
For more information regarding this you can see this link.