Sinnoh Route 216 & 217. The music is amazing, and I like how the snow looks in the 4th Generation games. The route always had a calming effect on me, it's like.."Now that the Zubats of Mt. Coronet are gone, and I'm out of this nightmarish mountain, I can finally see daylight." and then you see the snow, and you just...chill out.
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