Experience disappearing after using destiny bond

[Regor95]

Hello everyone,
first of all, allow me to apologize for my disastrous english which will be summed up here with a translation by google translate.

I will try to explain this bug to you as best as possible.

 

Being someone very lazy for xp, and being the happy owner of a Gastly, I wanted to earn some xp in a certain way for my Squirtle.

I launched my Squirtle then switch on my Gastly.
The purpose of this?
Let all the xp go to my Squirtle.

Maybe this is intentional, I don't know.
But it works in normal games and not on game.

Upon victory, there is no xp award.

Attached, in case, screens of the pokemons in question and the trainers on which I did the tests, as well as information such as the route .
Then again, maybe trainers aren't supposed to give xp.

Once again, sorry for my terrible english and I hope that if there is a bug, I have helped to solve it.