|effect=Allows {{p|Absol}} to Mega Evolve into Mega Absol when held during battle.
|effect=Allows {{p|Absol}} to Mega Evolve into Mega Absol when held during battle.
|descxy=One variety of the mysterious Mega Stones. Have Absol hold it, and this stone will enable it to Mega Evolve during battle.
|descxy=One variety of the mysterious Mega Stones. Have Absol hold it, and this stone will enable it to Mega Evolve during battle.
|locxy=[[Kiloude City]] (after beating the player's rival; requires an upgraded [[Key Stone|Mega Ring]]).
|locxy=[[Kiloude City]] (after beating the player's rival)
}}
}}
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{{Item
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|effect=Allows {{p|Gengar}} to Mega Evolve into Mega Gengar when held during battle.
|effect=Allows {{p|Gengar}} to Mega Evolve into Mega Gengar when held during battle.
|descxy=One variety of the mysterious Mega Stones. Have Gengar hold it, and this stone will enable it to Mega Evolve during battle.
|descxy=One variety of the mysterious Mega Stones. Have Gengar hold it, and this stone will enable it to Mega Evolve during battle.
|locxy=[[Laverre City]] (from a {{tc|Hex Maniac}})
|locxy=[[Laverre City]] (from a {{tc|Hex Maniac}}; requires a member of the {{p|Gastly}} {{p|Haunter|evolution}} {{p|Gengar|family}} to be seen in the Pokédex)
During battle, the player can use their Mega Ring to Mega Evolve a Pokémon if it is holding the correct Mega Stone before it attacks. Mega Stones only affect Pokémon during battles, and Pokémon will revert back to their basic form once the battle has ended. All Pokémon that can undergo Mega Evolution have an equivalent Mega Stone that is named after them.
Mega Stones cannot be transferred to or from the correct holder: Thief and Covet do not take the Mega Stone, Knock Off does not remove the Mega Stone, Trick and Switcheroo fail, Fling and Bestow fail, and Symbiosis does not activate. Embargo and Magic Room also cannot prevent the use of Mega Stones to Mega Evolve Pokémon. Mega Stones are not consumed upon use, but only one Mega Stone can be used per battle.
All Mega Stones not directly given or sold to the player can only be found between 8 and 9 p.m. after Professor Sycamore has upgraded the player's Mega Ring to detect them. These Mega Stones do not appear as item balls in the overworld; rather, they are "hidden" items denoted by sparkles around their locations.
The stone for Blaziken, the Blazikenite, cannot be found through normal gameplay within X and Y. However, it can be obtained via special distributions and trading.
In the anime, Pokémon wear Mega Stones using equipment similar to that which their Trainers use to hold their Key Stones. The equipment disappears while the Pokémon is in its Mega Evolved state.
Mega Stones were first mentioned in Lumiose City Pursuit!, where Professor Sycamore told Ash that a "special stone" is required to trigger Mega Evolution, referring to Mega Stones.
Mega Stones made their first physical appearance in Mega Evolution Special I. The seen Mega Stones were Alain's Charizardite X, Astrid's Absolite, Remo's Garchompite, Siebold's Blastoisinite, and an unknown orange Mega Stone found by Alain from ancient ruins. In addition, a Lucarionite was seen in a painting shown to Alain by Professor Sycamore in a flashback, featuring the first ever Mega Evolution.
Diantha's Gardevoir's Gardevoirite appeared in XY028. The Embrace Pokémon was shown carrying its Mega Stone in a necklace around its neck.
A Lucarionite made an appearance in XY031, where it was found by Korrina in a cave near Geosenge Town. After battling a Blaziken guarding the Lucarionite—which was afterwards revealed to belong to Korrina's grandfather, Gurkinn—Korrina obtained the Mega Stone and used it to Mega Evolve her Lucario. The "raw" Lucarionite was later set in a bracelet by Makita, allowing Lucario to wear the Mega Stone.
Another Lucarionite appeared in XY032 under the ownership of Gurkinn. Much like Korrina's Lucario, Gurkinn's Lucario also wears its Lucarionite in a bracelet on its left wrist.
In Pokémon Origins
In the Pokémon Origins episode File 2 - Cubone, Mr. Fuji gave Red a Mega Stone and a Key Stone, although he did not tell Red what they truly were, saying that he would find out soon enough. In File 4 - Charizard, during Red's battle against Mewtwo, one of the stones was revealed to be a Charizardite X from Kalos. Together, it and the Key Stone triggered Red's Charizard's Mega Evolution, allowing it to Mega Evolve into Mega Charizard X and weaken Mewtwo enough to be caught.
Charizardite X
Absolite
Blastoisinite
Gardevoirite
Lucarionite
Lucarionite
