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The absolute champion of forgettable routes (and caves) is Gold/Silver/Crystal for the sole reason that you stumble into them before being able to actually explore them and they are so shit to navigate anyway so you end up ignoring them altogether.
You come across Dark Cave before the first gym, but you lack Flash and Rock Smash so you shrug and move to Violet.
You go through Union Cave before Azalea but you don't have surf, so you just cross it and forget about it.
You enter the Slowpoke Well at Azalea, but most of it is locked behind surf, so you just beat the Rockets at the starting area and leave.
There's the Whirl Islands close to Cianwood but you can't enter them until later, so you ignore it.
Mt. Mortar is just after Ecruteak but you can't explore it without Waterfall, so you just cross the main bridge to Mahogany and that's it.
Route 46 is right next to Blackthorne and has some trainers and good Pokémon to catch, but the route feels like some beta version leftover that it's so shit to navigate so you leave.