Mega Stones

Name	Location	Stone
Abomasite	Safari Zone in Polaris Town
Blastoisite/ Venusaurite/ CharizarditeX/Y	Herculis Town (lab, second floor): The player will only get one Pokémon Kanto Starter holding a Megastone. In the case of Charizard it wil be X for choosing Team Cipher; Y for choosing Team Aqua/Magma. Kingdom City: Sold by a Hiker in the Upper Class area for 1000
Sceptite/ Swampertite/ Blazikenite	Route 3X (Forest Cabin): The one the player receives matches their Aroma starter. Kingdom City: Sold by a Hiker in the Upper Class area for 1000
Absolite	Varlox Cave: after the player defeats Red and Odin/Zeus
Aerodactylite	Mystery Gift
Aggronite	Victory Road: Wormhole, Rock Climb needed (located near the beginning of the cave)
Alakazite	Constance City: Talk to lady near the Attack Box Shop with an Alakazam in the player's party.
Ampharosite	Cassiopeia Town: after clearing Therian Plateau
Banettite	Mount Press Internal Level 2 - Waterfall and Rock Smash required to access. To the right side of the screen.
Bisharpite	Route 1X: Wormhole Needed
Cacturnite	Carinae Town: After obtaining the Secret Badge, talk to a yellow-haired NPC who talks about Mega Stone artifacts.
Crawdite	Route 303: Waterfall needed.
Dugtrinite	Phoenix Iota: Defeat Moss in her house in the Phoenix Iota
Feraligatite	Maggiore City: Wormhole behind the Sigil Hall
Garchompite	Herculis Town: Go behind the laboratory
Gardevoirite	Route 317: Rock Climb needed. It is close to the entrance to Caspian City.
Gengarite	Kingdom City: Upper floor on the mid-left side of the city. Talk to the guy telling the player, "It's a dream" three times.
Golurkite	Katana Cave: Invisible item in the tunnel with an unreadable sign.
Gyaradosite	Route 304: Surf all the way to the right in the lake, it's on a sandbar
Heracrossite	Route 312: Rock Climb required, just before Route 313.
Houndoomite	Near the Team Olympus/Asgard Base: Wormhole Needed
Kangaskhanite	Obtained after trying to trade Arceus in the house north of Pokemon Center in Kingdom City (The player keeps Arceus)
Lucarionite	Magmax Cave Entrance: Wormhole needed
Latiasite	Ruined Tower: Dropped after capturing Lugia and then using Tesseract; Zeta exclusive
Latiosite	Ruined Tower: Dropped after capturing Ho-Oh and then using Tesseract; Omicron exclusive
Manectrite	Ladoga Town (after the player clears the Sigil Saga), it's to the left of a group of trees and right outside of a house, inside of a Pokéball.
Mawilite	Route 314: Wormhole Needed
Medichamite	Route 309: Rock Smash needed
Meganiumite	Kivu Town: Wormhole needed (located by the Secret Base spire)
Mewtwonite Y	Omicron - Located where the player caught Victini (The player needs to have finished the Aroma region before Mewtwonite appears) Zeta - Kingdom City: Sold by a Hiker in the Upper Class area for 1000
Mewtwonite X	Zeta - located where the player caught Jirachi (The player needs to have finished the Aroma region before Mewtwonite appears) Omicron -Kingdom City: Sold by a Hiker in the Upper Class area for 1000
Milotite	Route 325: Swim to the left at the start and then use Wormhole.
Pinsirite	Top left of Eternal Forest
Reuniclite	Kingdom City: House to the top left hidden away. Trade for a Solosis holding the stone by offering any level 1 Pokémon.
Scizorite	Blackfist City: Wormhole needed
Steelixite	Main quest (Aroma; given to the player)
Typhlosionite	Midnight Way: Wormhole needed
Tyranitarite	Quake Desert (after obtaining the Secret Badge); located in the bottom-left corner of the map.