Storm Badge - A Trip to the Coast

After obtaining the Fog Badge, return to the Pokémon Center in Ecruteak City to heal your Pokémon.

Utilize your Surf ability to explore new areas and find hidden items.

Violet City: Northwest of the Gym and southeast of Sprout Tower, surf in the small channel to find a PP Up and a Rare Candy.

Union Cave: Proceed to the next floor below where the Swift TM was found. Surf on the water near the ladder. To the east and north are trainers. The exit west leads to a secluded part of the Ruins of Alph with a trainer, grass, and a puzzle. In the southwestern corner of 1F, surf across a pond, descend via the ladder. Defeat the nearby trainer, then surf east to another trainer and a ladder. On the next floor, surf east along the rock wall to find an Elixir. Continue west and south to a four-way water intersection. The southern path has a trainer and a Hyper Potion. The western path leads upstairs to another trainer. South from where you landed, find another trainer and water. On Fridays, you can find a Lapras in this water.

Route 34: Travel south along the river on the west side of the route to find a clearing with three trainers. After defeating them, speak to the last trainer to receive a Soft Sand, which boosts the power of Ground-type moves by 10%.

Route 35: In the southwestern part of the route, near the Goldenrod gatehouse, surf across a small pond to find a MysteryBerry tree. MysteryBerries restore 5 PP to a move upon use.

Dark Cave & Route 46: These areas require Rock Smash and preferably Flash. (Details not provided in this excerpt).