The dive music of the 3rd gen is my favorite track in all the series. It just feels so fitting and relaxing.
https://www.youtube.com/watch?v=Z9vqvfxoRBgI'm glad they didn't ruin it in the remake (although I still prefer the original).
https://www.youtube.com/watch?v=yTUErAIfNWAAnd the underwater trainer encounter couldn't be better.
https://www.youtube.com/watch?v=O4jUf9-MFZAThen there's the meteor falls, which always give me vibes of the adventure of entering a mystical and dangerous old jrpg dungeon like in Illusion of Gaia, for example.
https://www.youtube.com/watch?v=i3GrO6kxJCwThen there's the route 120. No other track has given me those feelings of "the adventure continues!".
I always start to imagine how it must be coming from beating Winona after all the rain in route 119, get out of the dense foliage and suddenly see the bright route 120, still wet from the rain with pools everywhere, shining under the sun.
And this starts to sound.
https://www.youtube.com/watch?v=Y71w6N8HK_QOther favorites are forest and lake music of Sinnoh.
https://www.youtube.com/watch?v=xr9KFynxBpAhttps://www.youtube.com/watch?v=6PbnT0x0e5IIn my opinion, the track from Hoenn is the most adventurous one, while Sinnoh has the most relaxing music.