In this city:
Boutique
Pokémon School
Upon entering the city, You will see the first Pokémon Center in the game. Here, you can have your Pokémon healed, check the PC for Pokémon storage, change outfits and shop at the Poké Mart.
To have your Pokémon healed, just talk to the nurse on the counter. In order to access the boxes where your Pokémon are stored, simply use the PC to the immediate right of the nurse.
To the left of the nurse would be the Dressing Room. The dressing room is where you can customize your outfit. Outfits and accessories can be purchased in the Fashion/Style shops.
The Poké Mart is at the right of the nurse. You can purchase Potions and other essentials from here.
Once you are done with the Pokémon Center, head to its immediate right and enter the Style Shop.
The Santalune City Boutique is where you can buy hats and accessories for your character. You can try on items for free before buying them. Simply talk to the NPC with the red hat.
Select the items you want to wear and choose “Change” to preview it. You will then be asked if you want to buy the item. If not, you’ll just change back to your regular clothes.
Once you are done accessorizing, you may explore the town for a bit.
From the Fashion/Style Shop or the Pokémon Center, head to the left most corner of the town and enter the house to the left. Talk to the girl at the back and she will tell you about Gym Badgesand up to what level of Pokémon will obey you if you have those badges.
Go out and head for the house on the right. Talk to the person beside the television and she will tell you about your Friendship with your Pokémon. She will see how connected you are with the Pokémon at the head of your party. It is good to know the friendship level of your Pokémon as the move Return is based on your friendship.
Exit the house then head left and up to the fountain area. If you want, you can sit down on the bench for a scenic view.
From the fountain, head to the very left and enter the house. Talk to the hiker and he will offer to trade a Bunnelby for his Farfetch’d. It is up to you if you want to trade. Bunnelby can be found in Route 3 while wild Farfetch’d can be found on Route 22, just to the right of this city. His Farfetch’d would be nicknamed Quacklin and will be the same level as the Bunnelby you will trade with him. Note that you cannot change the names of traded Pokémon.
Go back to the fountain and directly behind it is the Pokémon school.
Enter it and check the white board at the very back. You can learn about the basics of status conditions here.
Before exiting the Pokémon School, speak with the man with white hair and he will give you X Attacks (x3) and X Defends(x3).
Go outside and head to the house to the right most of the fountain. Talk to the boy inside to obtain Great Balls(x3).
.For the last obtainable item in this town, head to the front of the Pokémon Gym. The gym is on the upper right corner of town, to the right of the Pokémon School. There should be an NPC at the entrance. She will challenge you to a battle. Accept the challenge.
.Roller Skater Rinka(Prize Money: P224)
When finished, you will obtain Roller Skates. You can use it by simply using the Circle Pad of the 3DS system. The speed can be controlled by how far you tilt the Circle Pad. After you defeated Rinka, she will move to the side and the Santalune City Pokémon Gym is now accessible.