In this town:
Specialty Shop: Potions
Rest House
Photo Spot
Upon entering Aquacorde town, head to the left to and you will be called out by your fellow trainers. You will be introduced to the other two trainers chosen by the professor, Trevor and Tierno trainers tasked to go on a journey to complete the Pokedex. Everyone will then start giving you nicknames, and you can choose what you would want them to call you. You will be given 4 options with "Pick your own" as the last option. After selecting your nickname, choose "Yes" to confirm.
After choosing your nickname, you will be asked to choose your starter. You may choose between chespin the Grass-type, fennekin the Fire-type and froakie the Water-type. You may choose a nickname for it if you wish.
Shauna will then choose the Pokémon whose type is weak against the Pokémon you chose while your Rival will choose the Pokémon that is strong against the type of the one you chose. After they select their Pokémon, You will then receive a Pokédex from Trevor and Prof's Letter from Tierno. Before you go on your adventure, you need to present the letter to your mom. Head back to Vaniville Town by exiting south.
As you try to exit south, you will be challenged by Shauna to a battle.
Pokémon Trainer Shauna (Pize Money: P500)
Pokémon:
She will have:
Your first Pokémon battle will be with Shauna and it should be easy as she chose the Pokémon that is weak against the Pokémon that you chose. Simply attack with the elemental move that your Pokémon has and you should be able to defeat her quickly.
After defeating Shauna, you may now head back to Vaniville Town. If you want, you may explore the town. There are three notable establishments; Specialty Shop for Potions, Specialty Shop for Pokéballs and a Rest House. To head there, go north from the town’s entrance until you see the fountain. Talk to the guy in front of the fountain to obtain a Potion
Lower right of the fountain is a store where you can buy Potions. The establishment on the upper right of the fountain is where you can have your Pokémon healed. The one to the left of the fountain is where you can buy Pokéballs.
There is also a Photo Spot on the upper right corner of town though you will not be able to use it early on in this part of the game.
After you are done exploring, go back to Vaniville Town and head for your house to give the letter to your mom. Your mom would then prepare your items for you and give you a Town Map. You will be able to view the Kalos region and your current location using the Town Map. Exit the house for a short cutscene.
Your family's Rhydon will see you off. After viewing the cuntscene, head back to Aquacorde Town. From Aquacorde Town, head for the north exit.