As much as I want to forget the Unova League as fast as possible, this episode was handled better than I thought it would be.
Pikachu vs Lucario might be the best single fight in this League. It helps that we didn't know whether Pikachu would lose or they would tie (well, we mostly knew). The ending of that battle with the realization that Pikachu's going to lose before he got knocked out was tense. I'm also glad that Virgil at least won the League, since it adds some usefulness to his character existing.
I also really liked the moment with Ash and Pikachu standing in the centre of the stadium. It gave me nostalgic vibes. The flashback montage was nice too. Odd that next time isn't a new adventure though.