The hut on the beach's west side is known as the Seashore House, where refreshments are sold to thirsty beachgoers. Defeat all three Trainers inside, then speak to the proprietor. He rewards your effort with a free six-pack of Soda Pop! From this point on, you can also buy individual bottles at 300 apiece.
The open-air market hosts numerous vendors peddling rare goods. A man near the southern entrance hints that you'll find even more bargains after obtaining TM43 (Secret Power). Permanent stat-boosting Vitamins can be purchased from the Energy Guru. The red-clad clerk standing next to him will give your lead Pokémon an Effort Ribbon if it has been well-trained. Also after obtaining TM43, another clerk appears from whom additional copies of that and TM10 (Hidden Power) may be purchased.
Pokémon Fan Club
The Pokémon Fan Club can be found just north of the Market. If your lead Pokémon is friendly enough toward you, you can receive a Soothe Bell from the woman near the back wall. Visit with the club's chairman to have him examine your lead Pokémon's condition. If any of its five Contest stats are high enough, he will reward you with a special item—a Red, Blue, Pink, Green, or Yellow Scarf. When held, these items boost their respective stat during the Appeal Round of a Pokémon Contest.
North of the Fan Club building is the home of the Name Rater. This man has the power to evaluate and change your Pokémon's nicknames as often as you'd like. However, he cannot change a Pokémon's nickname if it first belonged to someone else.
Pokémon Contest Hall
The local Pokémon Contest Hall stands in the northwest corner of the city. This building hosts only Hyper Rank Contests. In order to participate, you'll need to first clear a Super Rank Contest in the Fallarbor Contest Hall, and a Normal Rank Contest in the Verdanturf Contest Hall before that. But even though you can't take part in a Contest just yet, there are still items to collect inside. Speak to the little girl near the entrance to receive a Pokéblock Case, which holds up to 40 candies that can be fed to a Pokémon to increase its condition for Contests. In addition, you can visit the back room and talk to the Sailor here to receive TM41 (Torment).
The Harbor is located in the city's northeast district. Since construction is not yet complete on the new ferry, there is little to do here at the moment.
At first, it is impossible to enter the Oceanic Museum because of the Team MagmaR/Team AquaS Grunts lined up outside. But by the time you visit the shipyard, the group has made its way into the building. Pay the 50 entrance fee to follow them inside. Those that can't afford it will be mistaken as part of "the group that came in earlier", and allowed in for free.
The Grunts are more interested in the exhibits than battling with you, so speak to them in an effort to gauge their intentions. A Grunt near the entrance is shocked to see you; it's the same guy you fought back in Rusturf Tunnel! He's learned not to mess with you, and begs forgiveness with TM46 (Thief) before fleeing the scene.
Go upstairs to find Captain Stern, examining a display in the lower-right corner. Before you can hand over the Devon Goods for his new ferry, you are attacked by two Grunts! Defeat one after the other to save the captain and complete the delivery for Mr. Stone. Shocked at their failure, the two begin to plan their next move when a stranger appears. It's their boss, Magma LeaderMaxieR/Aqua LeaderArchieS! He wonders aloud why you would want to hinder their plans, but forgives you as being too young to understand their ideals. As the group departs, he warns against interfering with their future plans.
The Trick House is located farther north, near the Route 103 junction. The building's owner, the Trick Master, is a fun-loving prankster who has crafted many entertaining tricks for travelers. Don't let his hard work go to waste!
When you step inside, you can't shake the feeling that someone is watching you. The mischievous Trick Master is hiding somewhere! Search the entire room until you find him, when he accepts your challenge and disappears. Certain field moves are required for most of the mazes, so you will need to return later to complete the rest.
Inside the Maze
Once he leaves, examine the scroll on the wall to find a secret passage that leads to a devious maze. Navigate the maze and battle Trainers as you search for a rolled-up scroll with a secret code. Reach the back of the maze and examine the hanging scroll. Inscribe the code on the hidden door to open it. There's no going back, so be sure to find everything the maze has to offer before entering the next room!
Trick Master's Room
The Trick Master waits here for all challengers. Speak to him to receive your reward, then leave through the exit in the north wall. After the last challenge, you can find a hidden Nugget where the Trick Master had stood.
Rival Battle 2
Go east from the Trick House and pass beneath Cycling Road. Turn north and continue on until you meet May/Brendan again. It seems like ages since you last met, so prove to your friend how far you've come as a Trainer!
After the battle, May/Brendan hands you the Itemfinder, a special gadget that allows you to search the surrounding area more thoroughly to discover hidden items! Search the underpass for treasure as you continue on to Mauville City.
Route 103 (optional)
Go to the left of the Trick House. Back to Route 103!. This is the eastern side of the route. It won't take you back to Oldale Town before you earn more Badges, but there are a lot of Trainers here. It's a good idea to battle them all— it's excellent training for your upcoming Gym battle.