Walkthrough
Waiting for you on Route 1 will be Hop, and he will suggest heading through the Wild Grasses while there. Route 1 is a very small path that connects Postwick and Wedgehurst, one so small that it only contains Wild Pokemon. There aren't even any Trainers looking to battle on Route 1! But it would be a good idea to battle a few of these Wild Pokemon, as it will help you level up your Starter Pokemon without much trouble.
Skwovet (50%): Levels 3-6
Rookidee (30%): Levels 3-6
Wooloo (15%): Levels 3-6
Nickit (5%): Levels 3-6
Skwovet (40%): Levels 2-5
Blipbug (30%): Levels 2-5
Caterpie (15%): Levels 2-5
Grubbin (10%): Levels 2-5
Hoothoot (5%): Levels 2-5
Items
Potion: Between Two Grass Patches
Paralyze Heals: Northeast Grass Patch