* Route 29: This is the most common location to find Oddish, especially at night. You can encounter them in the tall grass.
* Route 35: Oddish can also be found in the grass on this route, but it's less common than Route 29.
* National Park (Day): If you've already beaten the game and obtained the National Dex, Oddish can also be found here during the day.
Remember: Oddish has a higher chance of appearing at night, so if you're struggling to find one, try exploring these routes after dusk.