Does friendship rise and fall during battle??

Question

Lets say during a battle you use a revival herb will you loose friendship right there in battle.

(also applies to fainting in battle)

Answer 1

I tested this with my Blissey and Return, Return did the same damage as before. The friendship will rise/fall after the battle.

Answer 2

No, not during the battle, but after, yes. There is still no differance.

There are many ways that friendship can be effected from a battle. Items will have the same effect as out of uses, so bitter herbs will still decrease happiness, and fainting will also. Pokemon can get happier from battles if they're in an important battle such as the Elite Four or a Gym Leader. As mentioned before, the friendship's effects take place after the battle, or else the game may get confused with Return/Frustration power.