>>25206208I spent ages grinding through the routes below Blackthorne to fight all the trainers and collect all the items. Its easily the most distinctive route of Johto to me, especially considering 3 of my favourites (at the time) were found there (Skarmory, Donphan, Gligar)
Any route that can't be 'completed' by going through once generally becomes memorable. It was also cool getting to the bottom and realising that this was that route you couldn't go far into aaaalll the way back when you started the game, right next to New Bark Town.