Yes we all saw how good she fought in the battle. That means that she is a fair battler. She will do well in a Gym battle in that upcoming ep. Battle has never been her problem but the Appeals.
The ep was very good, I liked how we got to see more of her past and learn about how they fought in the battle with help of this past. The battle in itself was good, Chimchar vs. Piplup was cool. Just seeing all of their Pokemons give me a great feeling.
TR and their Mecha was cool and the background music very good.
We say goodbye in the pouring rain
And I break down as you walk away.
'Cause all my life I felt this way
But I could never find the words to say
~ Stay by Hurts