There are lot of Mega Evolution for the Pokémon are using the Key Stone or Mega Stone.

Introduced in X and YEdit

Item Evo. From Evo. Into Type
Venusaurite Venusaur Mega Venusaur Grass-type/Poison-type
Charizardite X
Charizardite Y
Charizard Mega Charizard X
Mega Charizard Y
Blastoisinite Blastoise Mega Blastoise Water-type
Alakazite Alakazam Mega Alakazam Psychic-type
Gengarite Gengar Mega Gengar Ghost-type/Poison-type
Kangaskhanite Kangaskhan Mega Kangaskhan Normal-type
Pinsirite Pinsir Mega Pinsir Bug-type/Flying-type
Gyaradosite Gyarados Mega Gyarados Water-type/Dark-type
Aerodactylite Aerodactyl Mega Aerodactyl Rock-type/Flying-type
Mewtwonite X
Mewtwonite Y
Mewtwo Mega Mewtwo X
Mega Mewtwo Y
Ampharosite Ampharos Mega Ampharos Electric-type/Dragon-type
Scizorite Scizor Mega Scizor Bug-type/Steel-type
Heracronite Heracross Mega Heracross Bug-type/Fighting-type
Houndoominite Houndoom Mega Houndoom Dark-type/Fire-type
Tyranitarite Tyranitar Mega Tyranitar Rock-type/Dark-type
Blazikenite Blaziken Mega Blaziken Fire-type/Fighting-type
Gardevoirite Gardevoir Mega Gardevoir Psychic-type/Fairy-type
Mawilite Mawile Mega Mawile Steel-type/Fairy-type
Aggronite Aggron Mega Aggron Steel-type
Medichamite Medicham Mega Medicham Fighting-type/Psychic-type
Manectite Manectric Mega Manectric Electric-type
Banettite Banette Mega Banette Ghost-type
Absolite Absol Mega Absol Dark-type
Garchompite Garchomp Mega Garchomp Dragon-type/Ground-type
Lucarionite Lucario Mega Lucario Fighting-type/Steel-type
Abomasite Abomasnow Mega Abomasnow Grass-type/Ice-type

Introduced in Omega Ruby and Alpha SapphireEdit

Item Evo. From Evo. Into Type
Beedrillite Beedrill Mega Beedrill Bug-type/Poison-type
Pidgeotite Pidgeot Mega Pidgeot Normal-type/Flying-type
Slowbronite Slowbro Mega Slowbro Water-type/Psychic-type
Steelixite Steelix Mega Steelix Steel-type/Ground-type
Sceptilite Sceptile Mega Sceptile Ground-type/Dragon-type
Swampertite Swampert Mega Swampert Water-type/Ground-type
Sablenite Sableye Mega Sableye Dark-type/Ghost-type
Sharpedonite Sharpedo Mega Sharpedo Water-type/Dark-type
Cameruptite Camerupt Mega Camerupt Fire-type/Ground-type
Altarianite Altaria Mega Altaria Dragon-type/Fairy-type
Glalitite Glalie Mega Glalie Ice-type
Salamencite Salamence Mega Salamence Dragon-type/Flying-type
Metagrossite Metagross Mega Metagross Steel-type/Psychic-type
Latiasite Latias Mega Latias Dragon-type/Psychic-type
Latiosite Latios Mega Latios Dragon-type/Psychic-type
Dragon Ascent Rayquaza Mega Rayquaza Dragon-type/Flying-type
Lopunnite Lopunny Mega Lopunny Normal-type/Fighting-type
Galladite Gallade Mega Gallade Psychic-type/Fighting-type
Audinite Audino Mega Audino Normal-type/Fairy-type
Diancite Diancie Mega Diancie Rock-type/Fairy-type

All items (9)