Walkthrough
Route 18 will lead you directly into Route 17. This is a huge path that is commonly referred to as Cycle Road, since you will be required to ride your bicycle the entire time you're on Route 17. There are loads of Pokemon Trainers looking to battle here.
Wild Pokemon
Grasses:
Doduo (35%): Levels 24-28
Spearow (30%): Levels 20-22
Raticate (25%): Levels 25-29
Rattata (5%): Level 22
Fearow (5%): Levels 25-27
Pokemon Trainers
Cue Ball Isaiah: Level 29 Machop, Level 29 Machamp
Biker Virgil: Level 28 Weezing, Level 28 Koffing, Level 28 Weezing
Cue Ball Raul: Level 29 Mankey, Level 29 Primeape
Biker Billy: Level 33 Muk
Biker Nikolas: Level 29 Voltorb, Level 29 Voltorb
Cue Ball Zeek: Level 33 Machoke
Cue Ball Corey: Level 29 Primeape, Level 29 Machoke
Biker Jaxon: Level 29 Weezing, Level 29 Muk
Cue Ball Jamal: Level 26 Mankey, Level 26 Mankey, Level 26 Machamp, Level 26 Machop
Biker William: Level 25 Koffing, Level 25 Weezing, Level 25 Koffing, Level 25 Koffing, Level 25 Weezing
Pokemon Trainers - VS Seeker Rematch
Cue Ball Isaiah: Level 49 Machoke, Level 49 Machamp
Cue Ball Corey: Level 49 Primeape, Level 49 Machamp
Biker Jaxon: Level 49 Weezing, Level 49 Muk
Items
Full Restore: ItemFinder
PP Up: ItemFinder
Rare Candy: ItemFinder
Max Revive: ItemFinder
Max Elixir: ItemFinder