Located to the north of the Pokémon Center, Dewford Hall is known as "Everyone's Information Exchange". Though Dewford is a tiny island community, when someone coins a trendy phrase here, it quickly spreads throughout the region. Speak to the boy outside the building to learn that "Potion festivals" are the coolest thing in cool right now; if you disagree, he offers a chance to change the current phrase, which the residents inside will quickly adopt.
Hook the Big One!
Speak to the Fisherman outside the Gym, and answer his question to receive the Old Rod. This low-end fishing rod can hook Pokémon from any body of water, so be sure to try it out everywhere!
Dewford Town Pokémon Gym Leader: Brawly
A big wave in fighting!
The Dewford Gym specializes in Fighting-type Pokémon. Flying-, Psychic, and Fairy-type moves are the most effective here, so this is a great opportunity to train Taillow, Beautifly, Wingull, or Ralts. Keep your Normal-, Rock-, and Dark-type Pokémon out of the fray for now. The Gym is modeled as a fitness center, filled with weight-lifting equipment and exercise machines. The buff Trainers inside hone their skills by training in total darkness. Step on the floor switches in the main hall to temporarily light up the darkened rooms, then plot a path forward before stepping into the darkness.
Even with only two Pokémon, Brawly can be a tough opponent. Both his Machop and Makuhita have the Guts Ability, which boosts the Pokémon's Attack by 50% when afflicted by any status condition. Bulk Up allows the user to raise its Attack and Defense, and Machop can deal even more damage by lowering the target's Defense with Leer.
After the battle, Brawly awards you the Knuckle Badge, which ensures obedience of all Pokémon up to level 30. He also hands out TM08 (Bulk Up) as a prize.
If you speak to Brawly again, he suggests checking out Granite Cave to the north of town. The place is filled with rare stones and wall paintings thousands of years old, and his friend Steven rushed there as soon as Brawly told him about it.
Follow the tunnel to the northwest to find a Hiker, who gives out TM70 (Flash). Turn north and follow the sloping path down to the first floor's rear chamber.
In the rear chamber, you find Steven admiring an ancient wall painting. Give him the Letter from Mr. Stone to complete your mission, and Steven gives you the TM for his favorite move, Steel Wing, in return.
This ancient artwork was only recently discovered, and attracts visitors from far and wide.
A huge Pokémon is depicted in a terrible rage, with what appear to be omegas (Ω) marked on either arm. Volcanoes erupt all around this behemoth, while humans and Pokémon are overwhelmed by its power. In addition, there seems to be a meteor in the shape of a triangle falling from the sky, while the rest of the heavens are dominated by a monstrous, broiling sun.
A gigantic Pokémon is shown wreaking havoc, with what appear to be alphas (α) marked on its arms. The sea swells around this leviathan in enormous waves and a great storm rages overhead, with heavy rain and lightning bolts. A falling star in the shape of a triangle appears over the figures of defeated people and Pokémon, a dark herald of their suffering.
Like with Routes 105 and 106, there is no opportunity to fully explore the area at the moment. There is little of interest on Route 107, but Route 108 holds what remains of the half-sunken Sea Mauville facility.