In Brightest Day, In Blackest Night ...
As expected, a disappointing filler episode.
I don't recall us ever considering learning a new move a filler
If the writers made Ash save Chargabug successfully and not made him get hurt and knocked out, it'd have been much better, simple.
You seem to have an issue with Ash facing the consequences of his actions and not come out on top. It's the same logic used to defend Ash jumping off roof tops and mountains.