"Haha, yeah. It would have also gone completely if Charizard listened to be back then, too. But that's all right. We've gotten a lot better since then, right Pikachu?"

Pikachu gives a confidence response. Of course they have!

"Ehhhh, really? I didn't know you battled, Professor! I wanna see 'em!" He's not even going to ask about the other leagues he and Gary have been in. Seeing the Professor battle sounds a lot more interesting to him at the moment.