I don't know about that track, but the Japanese version has been using a ton of early Kanto music lately, probably due to the setting.
Don't trust Wikipedia with your life. The Pichu article once said the Pichu Bros. had a TV show on Nickelodeon. -_-
I haven't seen the first episode or any pre-AG episodes in Japanese (aside from banned eps) but I seriously doubt that the first Jap ep suck. It had Kasumi slapping Satoshi. It can't suck.
Aside from the occasional fixed error or beneficial edit, I don't really see how the Pokémon dub could ever, ever, ever be better than the original.