The tune, "Get Fired Up Notch-Eared Pichu", is sung by geek princess Shoko Nakagawa, who also voices Giza Mimi Pichu ("Notch-Eared Pichu"). It's a catchy and cute song. You know, for whatever the hell it is.
Those who want to see Shoko Nakagawa and hear the song at the same time, we've got you covered. Those who don't, well.