I like all of the themes from the games, but Goldenrod City's stands out for some reason. It's upbeat and lively, a style the rest of the tunes fail to produce.
That I have to investigate... everybody's got their own taste :] I personally fell in love with the
Violet City tune the first moment I heard it. That might be the best tune in all of the games, IMO. Think it's in Olivine too...
Oh, second best btw. There's the
Last-Rival-Champion battle theme in R/B/Y (Yellow for my part, but I think the music is the same in all first gen?) I remember the wish for hearing this music made me work all the way to the end, even if I had a pokémon team I didn't really like and didn't really want to use (I've re-started Yellow COUNTLESS times and tried different teams, with different success ^^")
This tune is in G/S/C as well, of course. But it's not nearly as good there, with the "concussion" or what to call it...
Oh and there's another OLD tune that simply makes me feel happier than everything else. The short little song heard after you go into the
hall of fame in R/B/Y, and record your pokémon and your pokédex for the "last" time. And the
ending music in first gen is wonderful too. Simply wonderful~ And the
Pallet theme of course. Nostalgia yesh.
I can probably go on about music all day long. For a hundred super-long posts. Hm. There should almost be a section on PC for music/game music/pokémon game music ^^~ (no there probably shouldn't be)(it would die)(I'd FIGHT to keep it alive)(but it'd fail)