As usual I found a goldmine on reddit.
Here is the large guide for Pokémon X/Y on reddit, but I will include a few important links below with one or two copy and paste jobs from the important links incase reddit is blocked from the current computer you are using. /u/mspaint_exe compiled the links on reddit; he receives all the credit for doing that.
I looked online for some sort of guide to what shops offered which items, and as I found nothing I decided to make one myself. All marts offer the same basic items depending on how far you are in the game, but in certain towns you can purchase specialty items from the right-hand clerk.
All prices listed here are standard and do not factor in Bargain Power (O-Power).
The marts in Central Lumiose, Camphrier, Ambrette, Geosenge, Dendemille, Couriway, and the Pokemon League do not sell any specialty items.
Battle Items and Vitamins
|X Speed, 350||Protein, 9800|
|X Attack, 500||Iron, 9800|
|X Defense, 550||Calcium, 9800|
|Guard Spec, 700||Zinc, 9800|
|Dire Hit, 650||Carbos, 9800|
|X Accuracy, 950||HP Up, 9800|
|X Sp. Atk, 350|
|X Sp. Def, 350|
*Snowbelle City Mart sells all seven of these balls at the listed prices.
|Heal Ball, 300||Net Ball, 1000||Quick Ball, 1000|
|Net Ball, 1000||Nest Ball, 1000||Timer Ball, 1000|
|Nest Ball, 1000||Dusk Ball, 1000||Repeat Ball, 1000|
Coumarine is also where you can find every type of Incense for 9600 each. Ride the monorail to get to the merchant. Next to him you will find a stand that offers one free random berry everyday.
|TM78 Bulldoze, 10000||TM28 Dig, 10000||TM14 Blizzard, 70000||TM50 Overheat, 80000|
|TM76 Struggle Bug, 10000||TM84 Poison Jab, 10000||TM25 Thunder, 70000||TM93 Wild Charge, 50000|
|TM75 Swords Dance, 10000||TM20 Safeguard, 30000||TM38 Fire Blast, 70000||TM68 Giga Impact, 90000|
|TM11 Sunny Day, 50000||TM07 Hail, 50000||TM52 Focus Blast, 70000||TM33 Reflect, 30000|
|TM18 Rain Dance, 50000||TM37 Sandstorm, 50000||TM15 Hyper Beam, 90000||TM16 Light Screen, 30000|
*South Lumiose is also where you can find the PokeMiles merchant.
There are also several shops outside of the Marts where you can get specialty items. Here are a few you can find in Lumiose City:
|NORTH BLVD||AUTUMNAL AVE||VERNAL PLAZA|
|Lumiose Bakery||Pokeball Boutique||Herboriste|
|Menu changes.||Quick Ball, 1000||Heal Powder, 450|
|Dive Ball, 1000||Energy Powder, 500|
|Timer Ball, 1000||Energy Root, 800|
|Premier Ball, 200||Revival Herb, 2800|
|Heal Ball, 300||Stone Emporium|
|Net Ball, 1000||Fire Stone, 2100|
|Dusk Ball, 1000||Water Stone, 2100|
|Repeat Ball, 1000||Leaf Stone, 2100|
|Luxury Ball, 1000|
|Berry Juice Shoppe|
|Menu changes daily.|
The old man in purple in the right corner of the Stone Emporium will sell you a different Kanto Starter Mega Stone every day, starting at 1,000,000. His prices change depending on your style rating.
This site offers a nice full guide to Lumiose City, so check that out for information on Cafes and Boutiques.
The Battle Maison is located in Kiloude City. All items are purchased with Battle Points (BP), which you can earn participating in Maison battles.
|Vitamins (2)||Power Items (16)||Hold Items (16)||Hold Items (32)||Hold Items (48)||Evolution Items (32)|
|Protein||Power Bracer||Toxic Orb||White Herb||Wise Glasses||Protector|
|Calcium||Power Belt||Flame Orb||Power Herb||Choice Specs||Whipped Dream|
|Iron||Power Lens||Absorb Bulb||Scope Lens||Sachet|
|Zinc||Power Band||Cell Battery||Zoom Lens||Electirizer|
|Carbos||Power Anklet||Red Card||Wide Lens||Magmarizer|
|HP UP||Power Weight||Eject Button||Muscle Band||Reaper Cloth|
|Weakness Policy||Focus Band||Up-Grade|
|Ring Target||Choice Band||Dubious Disc|
There is also an Ability Capsule for 200 BP.
|TM23 Smack Down||32|
|TM34 Sludge Wave||32|
|TM51 Steel Wing||32|
|TM72 Volt Switch||48|
|TM85 Dream Eater||48|
In the South Lumiose Pokemon Center, an old man in a suit will trade you prizes for PokeMiles. You can earn PokeMiles by participating in trades. I’ve been told that if you use Game Sync, you can get the prizes for half price.
This is given to you when you save Abomasnow in Frost Cavern.
You will get this stone when you defeat your rival in Kiloud City in the postgame.
This one is in Ambrette Town, where you’ll get it from a scientist in the Fossil Lab. The scientist is located on the right side of the lab.
This one is found at night and is exclusive to Pokemon Y. When you enter Cyllage Gym, go to the right and climb the first wall, then climb the next wall on the right. It is on the ground around the corner.
This one is found at night. Find this Mega Stone on B3F of the Reflecting Cave in the postgame.
Go in Azure Bay and you’ll find an old man on an island who will give this to you. The man is standing next to a fisherman and the island is just south of the Sea Spirits Den entrance.
Find it in the Chamber of Emptiness at night.
When you get to choose one of the former starter Pokemon from Professor Sycamore, pick Squirtle and you’ll get this Mega Stone. If you didn’t get it from him, you will be able to buy it from a man in the Stone Emporium in Lumiose City in the postgame. It costs 150,000 and is only available every three days.
You get this from the event Torchic. You need to go to the main menu and choose Mystery Gift. Select Receive Gift, then Via Internet and you’ll get the Torchic after visiting talking to the woman to the left of the desk in any Pokemon Center. It’s holding the Blazikenite.
When you get to choose one of the former starter Pokemon from Professor Sycamore, pick Charmander and you’ll get this Mega Stone. Depending on the version of the game you have, you’ll receive either the X or Y version of the stone. If you didn’t get it from him, you will be able to buy it from a man in the Stone Emporium in Lumiose City in the postgame. It costs 150,000 and is only available every three days.
This one is found at night. You’ll find this one near a small tower near the end of Victory Road. The tower is behind a wall that needs to be destroyed by Rock Smash.
Find Diantha in Lumiose City, who is in a small cafe (Cafe Soleil). Trade any Pokemon with her to get a Ralts with the stone.
A black-haired woman will give you this in Lavarre City.
You can find this one at night. It’s in the southeastern section of Couriway Town. There are three small waterfalls and this stone is in the middle one.
This one is found at night and is exclusive to Pokemon Y. It’s found in some tall grass in Santalune Forest, near the Route 2 exit/entrance.
This stone is found at night and is exclusive to Pokemon Y. In Route 16, there is a spot where two skaters are going around a rock formation. The stone is on the ground on the southern side.
This one is found at night. Go inside Glittering Cave and take the first right. The stone will be found at the dead end.
After defeating Korrina at the Tower of Mastery, she’ll give you this.
This stone is found at night and is exclusive to Pokemon X. In Route 16, there is a spot where two skaters are going around a rock formation. The stone is on the ground on the southern side.
This one is found at night. When you enter Shabboneau Castle, go to the left and use the stairs to get to the second floor. The stone is on the ground just north of the western staircase.
This one is found at night. It can be found in Lavarre City, by a well.
The stone you receive depends on the version of the game you have. You’ll get the stone when you capture Mewtwo in the cave west of Pokemon Village.
This one is found at night and is exclusive to Pokemon X. It’s found in some tall grass in Santalune Forest, near the Route 2 exit/entrance.
This one is found at night. It can be found behind the Abomasnow in Frost Cavern.
This one is found at night and is exclusive to Pokemon X. When you enter Cyllage Gym, go to the right and climb the first wall, then climb the next wall on the right. It is on the ground around the corner.
When you get to choose one of the former starter Pokemon from Professor Sycamore, pick Ivysaur and you’ll get this Mega Stone. If you didn’t get it from him, you will be able to buy it from a man in the Stone Emporium in Lumiose City in the postgame. It costs 300,000 and is only available every three days.
List and Location of all HMs and TMs on Serebii.net
Those few I believe are important to the gameplay and to most of the people playing Pokémon X/Y. If you have another question that doesn’t seem to have a guide on this post please click the link at the top of the page that will guide you to the main guide list on reddit. If that link does not work for you I can just post the entire link section with at least some of the information from them so I do not create a huge post.