When the pokemon has sufficient hearts in the new affection mechanism in pokemon-amie, sometimes events such as surviving with 1HP occur during battle.
When this happens, one heart floats up and away from the pokemon.
Is this a "spending" of a "heart resource" that after a certain threshold would cause one heart to be lost in the pokemon-amie?
I've stopped petting/feeding/playing with that particular pokemon to find out but I can't conclude anything yet because I've not triggered the in-battle event many times.
Has anyone lost a heart in pokemon-amie? Is it possible to?