The Pacifist Route is one of the Endings in Underswap. It is similar to a Neutral Route, just you don't kill any monsters. There isn't really a difference between those two endings since you still have to fight Photoshop Temmie. This is the route that you need to do in order to go back and get the True Pacifist Route. If you do it this way you will get extra hp during the Photoshop Temmie fight. It also takes Lv 1 and 0 exp. Photoshop Temmie bonus will still work as long as you got no exp.
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