List of Mega Stones obtainable before defeating the Elite Four
- Abomasite(Frost Cavern, from Abomasnow after defeating Team Flare
- Aerodactylite(Ambrette Town Fossil Lab, after finding the scientist in Glittering Cave)
- Ampharosite(Azure Bay, from an old man)
- Blastoisinite(Professer Sycamore's Lab, Stone Emporium)
- Blazikenite(Torchic event)
- Charizardite X(Professer Sycamore's Lab, Stone Emporium)
- Charizardite Y(Professer Sycamore's Lab, Stone Emporium)
- Gengarite(Laverre City, from a Hex Maniac with Gastly, Haunter Gengar registered in the PokéDex)
- Lucarionite(Korrina's Lucario)
- Venusaurite(Professer Sycamore's Lab, Stone Emporium
Absolite, Aggronite, Alakazite, Banettite, Garchompite, Gardevoirite, Gyaradosite, Heracronite, Houndoomite, Kangaskhanite, Manectite, Mawilite, Medichamite, Mewtwonite X, Mewtwonite Y, Pinsirite, Scizorite and Tyranitarite are found post game.
