Remember to buy a piece of Harbor Mail for $50 before leaving the city - you'll need to trade that to someone later on.
Slateport Market
The Slateport Market on the west side of town is an open-air bazaar that features items not easily found anywhere else.
One vendor offers Secret Base decorations, the Energy Guru sells stat-boosting vitamins, and a woman will give your lead Pokémon a gift if it's happiness rating is high enough. Return here after finding TM43 (Secret Power), and the northernmost vendor will offer items for your secret base.
Pokémon Fan Club
Slateport is home to the Pokémon Fan Club's Hoenn branch. The people in the Fan Club are devoted to their Pokémon and give friendly advice. The woman by the back wall will check your lead Pokémon's happiness, and give you a Soothe Bell if it's rating is high enough.
Name Rater
Hoenn's Name Rater resides in Slateport. As always, he allows Trainers to change the nickname of any Pokémon they have captured or received in-game.
Those traded from outside sources will not be able to be renamed.
Pokémon Contest
The Hyper Rank Pokémon Contest building is located in Slateport. Only Pokémon who have beaten the Normal and Super Ranks are allowed to participate here. The Normal Rank Contest building is located in Verdanturf Town, so you won't be able to enter just yet. Talk to the little girl near the entrance to get the Pokéblock Case, which you will need to get into the Sarfai Zone later. Now that you have the case, you can blend berries with the people at the nearby machines. The resulting Pokéblocks raise a Pokémon's contest stats when consumed. Step into the back room, and talk to the sailor to get TM41 (Torment).
Oceanic Museum
The Oceanic Museum was established by Captain Stern to educate people about the ocean and everything that lies in its depths.
You need to get inside to deliver the Devon Goods to the captain; however, it seems that Team MagmaWrong template. See Template:Sup/doc. / Team AquaWrong template. See Template:Sup/doc. has plans for the museum, and you won't be able to enter with them blocking the entrance. Head south to visit Stern's Shipyard and talk to Dock, the guy looking at blueprints. He sees that you have the Devon Goods, and asks you to track down Capt. Stern, and now you'll be able to enter the museum.
The entrance fee is $50 (but if you have less than that, you'll be given free admission). The thug nearest the reception counter recognizes you from the Petalburg Woods, and gives you TM46 (Thief) before running away. Capt. Stern is on the second floor, but you'll be jumped by two Team MagmaWrong template. See Template:Sup/doc. / Team AquaWrong template. See Template:Sup/doc. grunts after you hand over the goods to the captain.
Trainers (Team Magma)
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Trainers with a Vs. Seeker by their names, when alerted for a rematch using the item, may use higher-level Pokémon.
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Trainers (Team Aqua)
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Trainers with a Vs. Seeker by their names, when alerted for a rematch using the item, may use higher-level Pokémon.
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After the battle, the team leader, MaxieWrong template. See Template:Sup/doc. / ArchieWrong template. See Template:Sup/doc., arrives and warns you not to meddle in his team's affairs before escaping with the two grunts. Stern takes the Devon Goods and returns to his shipyard.
You're done in Slateport for now, so head north to Route 110.