Fog Badge - Watering Pokemon and Catching Bugs

In Goldenrod City, go to the building east-northeast of the Gym and speak with the woman inside to receive the Squirtbottle.

Head north out of Goldenrod City onto Route 35.

Follow the linear path, battling Trainers. You will find TM04 (Rollout) north of a Trainer at the southern end of the route.

You can proceed to Route 36 or detour into the National Park.

In the National Park, on Tuesdays, Thursdays, and Saturdays, you can participate in the Bug Catching Contest.

If you entered the National Park from the south, head northeast and speak with the woman on the east side of a nearby flower bed to receive the Quick Claw.

Continue north along the stony path, battling Trainers in the grass and to the northeast, northwest, and southwest.

Route 36, accessible via grass on Route 35, allows access to Nidorans. In Pokémon Gold, you can find Growlithe; in Pokémon Silver, you find Vulpix. Stantler are also rare here.

Route 37 features Stantler, Fire-type Pokémon, Pidgey, Pidgeotto, and other unnoteworthy Pokémon.