During battle, the player can use their Key Stone-activating item, the Mega RingXY/Mega BraceletORAS to Mega Evolve a Pokémon before it attacks if it is holding the correct Mega Stone. Mega Stones only affect Pokémon during battles, and Pokémon will revert back to their basic form once the battle has ended or upon fainting. All Pokémon that can undergo Mega Evolution have an equivalent Mega Stone that is named after them, except for Rayquaza, which instead needs to know the move Dragon Ascent to Mega Evolve.
Mega Stones cannot be transferred to or from the correct holder during battle: 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 Pokémon can Mega Evolve per battle.
Availability
In Pokémon X and Y, all Mega Stones not directly given or sold to the player can only be found between 8 and 8:59 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 appear as sparkles on the ground.
In Pokémon Omega Ruby and Alpha Sapphire, Mega Stones on the ground appear as sparkles, like in Pokémon X and Y. Many Mega Stones that can be found in locations the player can already access will not appear until the player defeats or captures GroudonOR/KyogreAS. Some can only being obtained through certain requirements like clearing all the Master Ranks in the Pokémon Contests Spectacular and then defeating Lisia in one of the Master Rank Contest to receive the Lucarionite and receiving the Garchompite from Aarune after achieving Platinum Rank in Super-Secret Base by collecting 1,000 Flags.
The stone for Blaziken, the Blazikenite, cannot be found through normal gameplay in X and Y . However, it can be obtained via special distributions and trading. The stone for Diancie, the Diancite also cannot be obtain through normal gameplay in Omega and Alpha Sapphire. However, the stone can be obtained by transferring a or trading Diancie from Pokémon X and Y to Pokémon Omega Ruby and Alpha Sapphire, activating an event in Omega Ruby and Alpha Sapphire that will allow the Diancite to be obtained.
List of Mega Stones
Abomasite ユキノオナイトYukinoonite
ITEMS pocket
INTRODUCED IN
GEN VI
Cannot be bought
Cannot be sold
Effect:
Allows Abomasnow to Mega Evolve into Mega Abomasnow when held during battle.
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. Astrid's Absolite made a brief reappearance during the opening credits of Diancie and the Cocoon of Destruction.
Diantha's Gardevoir's Gardevoirite appeared in The Bonds of Evolution!. The Embrace Pokémon was shown carrying its Mega Stone in a necklace around its neck.
A Lucarionite made an appearance in The Cave of Trials!, 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 uncut Lucarionite was later set in an armband by McGinty, allowing Lucario to wear the Mega Stone.
Another Lucarionite appeared in The Aura Storm! under the ownership of Gurkinn. Much like Korrina's Lucario, Gurkinn's Lucario also wears its Lucarionite in an armband on its left wrist.
Steven's ShinyMetagross's Metagrossite appeared in SS031, wearing it as a large bracelet on its right foreleg. An Ampharosite was also seen in a flashback in the same episode, having been found by Lysandre before Alain could get his hands on it.
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.
Gallery
Charizardite X
Absolite
Blastoisinite
Gardevoirite
Uncut Lucarionite
Lucarionite
In the manga
In the Pokémon - The Legend of the Dragon King manga
In Pokémon - The Legend of the Dragon King, as the story of the manga is centred around Mega Evolution, several characters have Mega Stones. Akira owns both a Charizardite X and a Charizardite Y, Koji owns a Garchompite and Taichi has an Ampharosite.
Diantha's Gardevoir has been shown wearing its Gardevoirite around its head.
Lysandre owns a Gyaradosite for his Gyarados but is currently unable to Mega Evolve it.
Clemont has an Electrike which evolved into a Manectric searching for its Mega Stone, which it eventually joined X's team after a Team Flare Grunt ambushed the group and stole the Manectite.
Artwork
The following is a gallery of Mega Stone artwork as seen on the Pokémon Global Link.
Abomasite
Absolite
Aerodactylite
Aggronite
Alakazite
Altarianite
Ampharosite
Audinite
Banettite
Beedrillite
Blastoisinite
Blazikenite
Cameruptite
Charizardite X
Charizardite Y
Diancite
Galladite
Garchompite
Gardevoirite
Gengarite
Glalitite
Gyaradosite
Heracronite
Houndoominite
Kangaskhanite
Latiasite
Latiosite
Lopunnite
Lucarionite
Manectite
Mawilite
Medichamite
Metagrossite
Mewtwonite X
Mewtwonite Y
Pidgeotite
Pinsirite
Sablenite
Salamencite
Sceptilite
Scizorite
Sharpedonite
Slowbronite
Steelixite
Swampertite
Tyranitarite
Venusaurite
Trivia
The Aggronite and Houndoominite are only obtainable in Pokémon Y, despite Aron, Houndour, and their evolutions being exclusive to Pokémon X.
The design of the Mega Stones appear to be based on a common pattern found in the glass marble called a toothpaste marble.
Although Megastones cannot be removed using Trick, Thief or Knock Off used by NPCs or other players, Megastones that are used by pokemon that are released from the PC will be removed from your game and are not able to be obtained again.