Inspired by Corrie's thread asking for our favorite town/city themes from the different Pokémon regions, I thought it would be interesting to see what everyone's favorite route themes were. And since Scarlet & Violet and Legends: Arceus are basically open world and sort of lack proper routes, we'll include Legends: Arceus' area themes and Scarlet/Violet's province themes as well!
Unova, and its not even close, especially because of the different seasons.
My favourite route music by gen
Gen 1: Viridian Forest, Route 11
Gen 2: Dark Cave/Ice Path, Route 38, National Park
Gen 3: Route 119
Gen 4: Route 209, Mt. Coronet, Viridian Forest (HGSS)
Gen 5: Route 10, Route 11 (all seasons), Route 19 (all seasons) Abyssal Ruins...just to name a few
Gen 6: Kalos Route 15
Gen 7: none
Gen 8: maybe Alabaster Icelands in the daytime?
Gen 9: Tagtree Forest (riding)
I'm going to have to dig deep into my memory for some of these, but let's see...
Kanto: Route 11, Sevii Islands route theme (Fire Red/Leaf Green), Route 26-28 (Gold/Silver/Crystal)
Johto: Route 29, 42-44/Lake of Rage
Hoenn: Route 101, 110, 111
Sinnoh: Route 228 (Night), hands down, probably the best route theme in the whole series. Honorable mentions: Route 206, 216 (both day), and while not technically a route, I have to include Mount Coronet summit (the snowy area before Spear Pillar).
Unova: Route 2 and 6. Again, while not exactly a route I'm throwing Skyarrow Bridge in here.
I don't have enough experience with the games beyond gen 5 to really be able to judge the music there.