Route 1

Route 1, Kanto and the Sevii Islands (from Pokemon FireRed).

Levels are this area's own. In your first region they stay as shown; in a region you open later they are raised to match your progress, unless you started that region fresh. See levels.

Wild Pokemon

Grass and caves
Pokemon	Levels	Chance
Pidgey	2 to 5	50%
Rattata	2 to 4	50%