Mega Evolution

Discovered in Kalos

Alolan Regional Variants
Pokémon	Sprite	Type	Ability		Sprite	Type	Ability	Mega Stone
Venusaur		Grass Poison	Overgrow Chlorophyll			Grass Poison	Thick Fat	Venusaurite
Charizard		Fire Flying	Blaze Solar Power			Fire Dragon	Tough Claws	Charizardite X

Discovered in Hoenn

Alolan Regional Variants
Pokémon	Sprite	Type	Ability		Sprite	Type	Ability	Mega Stone
Beedrill		Bug Poison	Swarm Sniper			Bug Poison	Adaptability	Beedrillite
Pidgeot		Normal Flying	Keen Eye Tangled Feet Big Pecks			Normal Flying	No Guard	Pidgeotite
Slowbro		Water Psychic	Oblivious Own Tempo Regenerator			Water Psychic	Shell Armor	Slowbronite
Steelix		Steel Ground	Oblivious Own Tempo Sheer Force			Steel Ground	Sand Force	Steelixite
Sceptile		Grass	Overgrow Unburden			Grass Dragon	Lightningrod	Sceptilite
Swampert		Water Ground	Torrent Damp			Water Ground	Swift Swim	Swampertite

Beedrill		Bug Poison	Adaptability	Beedrillite
		Fire Flying	Drought	Charizardite Y

Discovered in Altaris

The majority of Alolan Regional Variants have adapted simply to new surroundings, predators, and climates. These changes are purely ecological in nature, with some human interference contributing to the genetic drift.

Altaris Mega Evolutions
Pokémon	Sprite	Type	Ability		Sprite	Type	Ability	Mega Stone
Altaran Beedrill		Bug Ground	Hyper Cutter Swarm Long Reach			Bug Ground	???	Beedrillite S
Ninetales		Fire	Flash Fire Drought			Fire Ghost	Solar Power
Arcanine		Fire	Intimidate Flash Fire Justified			Fire Dragon	Levitate
Altaran Arcanine		Fire Water	Oilslick Intimidate Corrosion			Fire Ice	Levitate
Altaran Gyarados		Water Dragon	Moxie Swift Swim Sheer Force			???	???	Gyaradosite S
Umbreon		Dark	Synchronize Inner Focus			Dark Poison	Corrosion
Mightyena		Dark	Intimidate Quick Feet Moxie			Dark Ground	Frightful Presence
Flygon		Ground Dragon	Levitate			Bug Dragon	Compound Eyes