Walkthrough
Once through Underground Path 7-8, you will come out on Route 7. This is an extremely small area home to a few Wild Pokemon, and that's about it. There are no Pokemon Trainers on Route 7, and the only Item to be found can only be done by using the ItemFinder. Because of the lack of essence to Route 7, you will quickly find yourself in Celadon City.
Wild Pokemon
Grasses:
Meowth (40%): Levels 17-20
Pidgey (30%): Levels 19-22
Oddish(FireRed)/Bellsprout(LeafGreen) (20%): Levels 19-22
Growlithe(FireRed)/Vulpix(LeafGreen) (10%): Levels 18-20
Items
Wepear Berry: ItemFinder