Situated between Routes 109 and 110, Slateport City is by far the biggest place you've yet reached, and it is filled with sights to see. From the Battle Tent to the Oceanic Museum, there's plenty to marvel at in this seaside metropolis.
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.
In the northeast stall, a woman hands out a Powder Jar to each visitor. This jar is used to store Berry Powder obtained by playing the Berry Crush minigame in a Pokémon Center's Union Room. Collect enough powder and you can trade it to her in exchange for vitamins and herbal medicine.
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.
The Slateport Battle Tent stands in the northwest corner of the city. If you enter to the Battle Tent after getting the Devon Goods in Oceanic Museum, then Scott will come out of the Battle Tent if you try to go in and urge you to take the challenge. At this location, entrants must select three Pokémon from a random list of six rental Pokémon, all at level 30. They must then face three opposing Trainers, and after defeating each one, challengers may trade one of their Pokémon for one belonging to their opponent. No details on the opponent's Pokémon are given; challengers must instead rely on their experience battling the opponent's team. The reward for winning three consecutive battles here is a Full Heal. No experience or prize money is awarded.
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 Aqua 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 you, so you can 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.
Trainers with a Vs. Seeker by their names, when alerted for a rematch using the item, may use higher-level Pokémon.
Shocked at their failure, the two begin to plan their next move when a stranger appears. It's their boss, Aqua LeaderArchie! He wonders aloud why you would even want to hinder their plans, but forgives you as he thinks you're too young to understand their ideals. As the group departs, he warns you against interfering with their future plans. When you step outside, you are approached again by Scott. He seems to be a talent scout of some sort, and takes the opportunity to register himself in your PokéNav before heading off. Its advisable to buy a piece of Harbor Mail for 50 before leaving the city, since you'll need to trade it to girl in Mauville City to get a new item.
If you didn't register Professor Birch in Littleroot Town, he will appear in this route. Not long after you pass by the southern entrance to Cycling Road, you run into Professor Birch. After a short conversation, he registers himself in your PokéNav so that you can get your Pokédex rated anytime.
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. A new challenge opens each time you earn a Badge. 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 3
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! May and Brendan use the same three Pokémon, but May leads with Wingull if the player chose Mudkip.
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.