This gym battle was one of my favorites. I loved how it focused on strategy instead of power, and how Ash lost but not in a ridiculous way like with Shootie. It seemed that Ash was really focused from the time he entered the library in the museum since he didn't really want to read the book he was asked to. I thought that a veteran battler like him would be more attentive.
I think it was good that Ash did not use Pikachu since it gives him a chance to make his newer Pokémon stronger. He seemed really motivated after his loss to do better. I think the Roar and Mean Look combination was especially potent since Ash only had two Pokémon. The animation of Mean Look looked really cool.