Walkthrough
Just north of Pallet Town is Route 1. This small path that leads directly to Viridian City doesn't contain any Pokemon Trainers looking to battle, but there are a couple of Wild Pokemon that can be found. It would be wise to defeat a couple of Wild Pokemon while you have a free moment since it will pay off down the road.
Wild Pokemon
Grasses:
Pidgey (50%): Levels 2-5
Rattata (50%): Levels 2-4
Items
Potion - From Poke Mart Employee