I hate hate HATE the Moor of Iccirus. I'm not fond of Chargestone either.
Chargestone Cave is what convinced me to start using repels. More thana decade with the games, and I've only started using them in White.
Route 4.
I'm not a fan of disallowed bike use, and slow walking.
why? its a good place to level your fighting/fire/grass/water pokémon
and with repel you cant catch Tynamo :D
Well tbh if you had a water starter I could see why it'd be really annoying, considering the electric types there. XD
Twist Mountain I hated so so much. It took me like 40mins to get through it the first time.