Mega Evolution

Blaziken, Mega Evolving into Mega Blaziken.

Mega Evolution a special kind of evolution that only affect certain kinds of Pokémon. It is discovered in Kalos, but as of right now, Mega Evolution still hold many mysteries.

Korrina and her grandfather Gherkinn (both hailing from Shalour City) are said to know a few secrets from Mega Evolving. Steven Stone, Pokémon Champion from Hoenn, is also intrigued by this process.

According to a Kalosian legend, Lucario was the very first Pokémon that ever Mega Evolved.

There's a process known as Primal Reversion, which has its similarities with Mega Evolution. Groudon and Kyogre can undergo through this to become Primal Groudon and Primal Kyogre, respectively. However, it is unknown if Rayquaza can use this process.

Usage

Key Stones usually take the appearance of this Mega Evolution sigil.

In order for a Pokémon to Mega Evolve, it first has to hold the correct Mega Stone, appropriately named after itself. A Blaziken has to Mega Evolve by holding a Blazikenite. If it's holding something like a Venusaurite, it won't work, as it only works for Venusaur. However, its Trainer has to hold and activate a Key Stone in order to have it work. The Key Stone can literally be hung or placed anywhere the Trainer wants: in a ring, bracelet, necklace, glasses, etc. But even with the necessary items in place, the Pokémon is unable to Mega Evolve if it doesn't have a strong bond with its Trainer.

A Pokémon can only Mega Evolve during a battle, and the Trainer can only Mega Evolve one Pokémon per battle. Mega Evolution is revertible, but the Mega Pokémon can only turn back into its original state when the battle is over, or when it faints. When a fainter Pokémon is revived, but already Mega Evolved before it fainted in the same battle, it cannot Mega Evolve again for the same match.

Mega Evolution can be used on the same turn as a normal attack, and always has priority before anything else.

Mega Stones cannot be stolen or switched with another item from other Pokémon. Therefor, Thief and Covet will turn into a regular attack, and the abilities Pickpocket and Magician will never succeed to take away a Mega Stone. The holder cannot get rid of a Mega Stone either, so moves like Fling and Bestow will fail instantly.

Moves that prevent the usage of held items, like Embargo or Wonder Room, do not prevent Mega Evolution. Status conditions won't prevent the Pokémon from Mega Evolving either.

There are only two instances when a Pokémon cannot Mega Evolve: shifting positions during a Triple Battle, and during the airborne phase of Sky Drop, when the target can basically do nothing at all.

Effects

Aside from the Pokémon having "Mega" before its name (e.g. Mega Scizor), they get a vast changes in their stats. The HP stat is the only stat that won't ever be affected. The stat boosts will give each Mega Evolution a boost of 100 points to their Base Stat Total. Mega Alakazam is the only exception, whose Base Stat Total boost is just 90 points.

These stat changes can completely turn a Pokémon and its strategies around. For example, Garchomp's highest stats were Attack and Speed, but its lowest were Special Attack and Special Defense, so it was typically used as a physical sweeper. However, Mega Garchomp has its Speed as its lowest stat, and gained a tremendous boost in Attack and Special Attack.

Aside from stats, the Pokémon usually gets its Ability changed as well. Sometimes, they get a different type combination. They can gain a new type while originally just single-typed (e.g. pure Electric-type Ampharos becomes Electric/Dragon), have their secondary type switched out for another (e.g. Mega Gyarados is Water/Dark, as opposed to regular Gyarados's Water/Flying), or removed altogether to become a single type (e.g. Aggron loses its Rock-type after Mega Evolution, becoming pure Steel).

The original movement order remains intact on the turn when Mega Evolution is activated, so the improvements or declines will be realized on the next turn instead.

List of Mega Evolution-capable Pokémon

Official

Before Mega Evolution				After Mega Evolution				Mega Stone
Pokémon	Type		Ability/ies	Pokémon	Type		Ability
Venusaur	Grass	Poison	Overgrow Chlorophyll (Hidden)	File:003Mega Venusaur.png Mega Venusaur	Grass	Poison	Thick Fat	File:Dream Venusaurite Sprite.png Venusaurite
Charizard	Fire	Flying	Blaze Solar Power (Hidden)	File:006Mega Charizard X.png Mega Charizard X	Fire	Dragon	Tough Claws	File:Dream Charizardite X Sprite.png Charizardite X
				File:006Mega Charizard Y.png Mega Charizard Y	Fire	Flying	Drought	File:Dream Charizardite Y Sprite.png Charizardite Y
Blastoise	Water		Torrent Rain Dish (Hidden)	File:009Mega Blastoise.png Mega Blastoise	Water		Mega Launcher	File:Dream Blastoisinite Sprite.png Blastoisinite
File:065Alakazam.png Alakazam	Psychic		Synchronize Inner Focus Magic Guard (Hidden)	File:065Mega Alakazam.png Mega Alakazam	Psychic		Trace	File:Dream Alakazite Sprite.png Alakazite
File:080Slowbro.png Slowbro	Water	Psychic	Oblivious Own Temper Regenerator (Hidden)	File:080Mega Slowbro.png Mega Slowbro	Water	Psychic	Shell Armor	Slowbronite
File:094Gengar.png Gengar	Ghost	Poison	Levitate	File:094Mega Gengar.png Mega Gengar	Ghost	Poison	Shadow Tag	File:Dream Gengarite Sprite.png Gengarite
Kangaskhan	Normal		Early Bird Scrappy Inner Focus (Hidden)	File:115Mega Kangaskhan.png Mega Kangaskhan	Normal		Parental Bond	File:Dream Kangaskhanite Sprite.png Kangaskhanite
Pinsir	Bug		Hyper Cutter Mold Breaker Moxie (Hidden)	File:127Mega Pinsir.png Mega Pinsir	Bug	Flying	Aerilate	File:Dream Pinsirite Sprite.png Pinsirite
File:130Gyarados.png Gyarados	Water	Flying	Intimidate Moxie (Hidden)	File:130Mega Gyarados.png Mega Gyarados	Water	Dark	Mold Breaker	File:Dream Gyaradosite Sprite.png Gyaradosite
File:142Aerodactyl.png Aerodactyl	Rock	Flying	Rock Head Pressure Unnerve (Hidden)	File:142Mega Aerodactyl.png Mega Aerodactyl	Rock	Flying	Tough Claws	File:Dream Aerodactylite Sprite.png Aerodactylite
Mewtwo	Psychic		Pressure Unnerve (Hidden)	File:150Mega Mewtwo X.png Mega Mewtwo X	Psychic	Fighting	Steadfast	File:Dream Mewtwonite X Sprite.png Mewtwonite X
				File:150Mega Mewtwo Y.png Mega Mewtwo Y	Psychic		Insomnia	File:Dream Mewtwonite Y Sprite.png Mewtwonite Y
File:181Ampharos.png Ampharos	Electric		Static Plus (Hidden)	File:181Mega Ampharos.png Mega Ampharos	Electric	Dragon	Mold Breaker	File:Dream Ampharosite Sprite.png Ampharosite
File:212Scizor.png Scizor	Bug	Steel	Swarm Technician Light Metal (Hidden)	File:212Mega Scizor.png Mega Scizor	Bug	Steel	Technician	File:Dream Scizorite Sprite.png Scizorite
Heracross	Bug	Fighting	Swarm Guts Moxie (Hidden)	File:214Mega Heracross.png Mega Heracross	Bug	Fighting	Skill Link	File:Dream Heracronite Sprite.png Heracronite
File:229Houndoom.png Houndoom	Dark	Fire	Early Bird Flash Fire Unnerve (Hidden)	File:229Mega Houndoom.png Mega Houndoom	Dark	Fire	Solar Power	File:Dream Houndoominite Sprite.png Houndoominite
File:248Tyranitar.png Tyranitar	Rock	Dark	Sand Stream Unnerve (Hidden)	File:248Mega Tyranitar.png Mega Tyranitar	Rock	Dark	Sand Stream	File:Dream Tyranitarite Sprite.png Tyranitarite
File:254Sceptile.png Sceptile	Grass		Overgrow Unburden (Hidden)	File:254Mega Sceptile.png Mega Sceptile	Grass	Dragon	Lightning Rod	Sceptilite
File:257Blaziken.png Blaziken	Fire	Fighting	Blaze Speed Boost (Hidden)	File:257Mega Blaziken.png Mega Blaziken	Fire	Fighting	Speed Boost	File:Dream Blazikenite Sprite.png Blazikenite
File:260Swampert.png Swampert	Water	Ground	Torrent Rain Dish (Hidden)	File:260Mega Swampert.png Mega Swampert	Water	Ground	Swift Swim	Swampertinite
File:282Gardevoir.png Gardevoir	Psychic	Fairy	Synchronize Trace Telepathy (Hidden)	File:282Mega Gardevoir.png Mega Gardevoir	Psychic	Fairy	Pixilate	File:Dream Gardevoirite Sprite.png Gardevoirite
File:302Sableye.png Sableye	Dark	Ghost	Stall Keen Eye Prankster (Hidden)	File:302Mega Sableye.png Mega Sableye	Dark	Ghost	Magic Bounce	Sablinite
File:303Mawile.png Mawile	Steel	Fairy	Intimidate Hyper Cutter Sheer Force (Hidden)	File:303Mega Mawile.png Mega Mawile	Steel	Fairy	Huge Power	File:Dream Mawilite Sprite.png Mawilite
File:306Aggron.png Aggron	Steel	Rock	Sturdy Rock Head Heavy Metal (Hidden)	File:306Mega Aggron.png Mega Aggron	Steel		Filter	File:Dream Aggronite Sprite.png Aggronite
File:308Medicham.png Medicham	Fighting	Psychic	Pure Power Telepathy (Hidden)	File:308Mega Medicham.png Mega Medicham	Fighting	Psychic	Pure Power	File:Dream Medichamite Sprite.png Medichamite
File:310Manectric.png Manectric	Electric		Static Lightning Rod Minus (Hidden)	File:310Mega Manectric.png Mega Manectric	Electric		Intimidate	File:Dream Manectite Sprite.png Manectite
File:334Altaria.png Altaria	Dragon	Flying	Natural Cure Cloud Nine (Hidden)	File:334Mega Altaria.png Mega Altaria	Dragon	Fairy	Pixilate	Altarite
File:354Banette.png Banette	Ghost		Insomnia Frisk Cursed Body (Hidden)	File:354Mega Banette.png Mega Banette	Ghost		Prankster	File:Dream Banettite Sprite.png Banettite
File:359Absol.png Absol	Dark		Pressure Super Luck Justified (Hidden)	File:359Mega Absol.png Mega Absol	Dark		Magic Bounce	File:Dream Absolite Sprite.png Absolite
File:373Salamence.png Salamence	Dragon	Flying	Intimidate Moxie (Hidden)	File:373Mega Salamence.png Mega Salamence	Dragon	Flying	Aerilate	Salamencinite
File:376Metagross.png Metagross	Steel	Psychic	Clear Body Light Metal (Hidden)	File:376Mega Metagross.png Mega Metagross	Steel	Psychic	Tough Claws	Metagrossite
File:380Latias.png Latias	Dragon	Psychic	Levitate	Mega Latias	Dragon	Psychic	Levitate	Latiasite
File:381Latios.png Latios	Dragon	Psychic	Levitate	Mega Latios	Dragon	Psychic	Levitate	Latiosite
Lopunny	Normal		Cute Charm Klutz Limber (Hidden)	File:428Mega Lopunny.png Mega Lopunny	Normal	Fighting	Scrappy	Lopunnite
File:445Garchomp.png Garchomp	Dragon	Ground	Sand Veil Rough Skin (Hidden)	File:445Mega Garchomp.png Mega Garchomp	Dragon	Ground	Sand Force	File:Dream Garchompite Sprite.png Garchompite
File:448Lucario.png Lucario	Fighting	Steel	Steadfast Inner Focus Justified (Hidden)	File:448Mega Lucario.png Mega Lucario	Fighting	Steel	Adaptability	File:Dream Lucarionite Sprite.png Lucarionite
File:460Abomasnow.png Abomasnow	Grass	Ice	Snow Warning Soundproof (Hidden)	File:460Mega Abomasnow.png Mega Abomasnow	Grass	Ice	Snow Warning	File:Dream Abomasite Sprite.png Abomasite
File:531Audino.png Audino	Normal		Healer Regenerator Klutz (Hidden)	File:531Mega Audino.png Mega Audino	Normal	Fairy	Healer	Audinite
Diancie	Rock	Fairy	Clear Body	File:719Mega Diancie.png Mega Diancie	Rock	Fairy	Magic Bounce	Diancite

Trivia

• Dragon and Psychic appear to be tied as the types with the most Mega Evolutions (eight), while Ice has the fewest (only one).
• So far, the only two Pokémon having two Mega Evolutions are Mewtwo and Charizard. Both of them hail from Kanto and are very popular among Pokémon fans.

Gallery

Mega Mewtwo Y vs. Mega Lucario

Diancie Mega Evolving into Mega Diancie

Charizard's Mega Evolutions, Mega Charizard X and Mega Charizard Y

Steven Stone and Mega Metagross

Shiny Mega Metagross