Mega Leonidas X:

Type 1: Dragon
Type 2: Life
Ability: Flame Body
Mega Leonidas Y:

Type 1: Dragon
Type 2: Life
Ability: Hard Sword(Blade and claw attacks become more stronger)
Mega Gothitelle:

Type 1: Psychic
Type 2: Life
Ability: Ribbon(Immune to all abnormal status)
Mega Reshiram:

Type 1: Dragon
Type 2: Fire
Ability: Megablaze(Dragon and Fire types are protected by super effective attacks)
Mega Berserker Dragon:

Type 1: Dragon
Type 2: Water
Ability: Mega Launcer
Mega Zekrom:

Type 1: Dragon
Type 2: Electric
Ability: Megabolt(Dragon and Electric types are protected from super effective attacks)
Mega Kyurem:

Type 1: Dragon
Type 2: Ice
Ability: Snow Warning
Mega Black Kyurem:

Type 1: Dragon
Type 2: Ice
Ability: Megabolt
Perfect Kyurem:

Type 1: Dragon
Type 2: Ice
Ability: Boltflare(Same as Turboblaze and Terravolt)
Mega White Kyurem:

Type 1: Dragon
Type 2: Ice
Ability: Megablaze
Mega Cherrim:

Type 1: Grass
Type 2: Life
Ability: Blossomstrorm(Grass and Life types are protected by super effective attacks)
Mega Typhlosion

Type 1: Fire
Type 2: Life
Ability: Eternal Flame(Causes a fiery field to appear, that damages all but fire types)
Mega Maganium:

Type 1: Grass
Type 2: Light
Ability: Eternal Forest(Causes the Grassy Terrain attack at the start of the battle)
Mega Feraligatr

Type 1: Water
Type 2: Dark
Ability: Mega Launcer
Mega Biolante:

Type 1: Dragon
Type 2: Grass
Ability: Speed Boost
Mega Bomb:

Type 1: Electric
Type 2: Fire
Ability: Bomb Shell(Prevents being KO'd by self-destructing moves)
Mega Flan:

Type 1: Poison
Type 2: Water
Ability: Mega Launcher
Mega Phantom Blaster Dragon:

Type 1: Dragon
Type 2: Dark
Ability: Duel Sword(Blade attacks can hit twice)
Mega Amaterasu Y:

Type 1: Life
Type2: Fairy
Ability: Goddess World(Life and Fairy types are protected by super effective attacks)
Mega Perfect Kyurem:

Type 1: Dragon
Type 2: Ice
Ability: Dragon Frost(Dragon and Ice types are protected by super effective attacks)
Mega Wailord:

Type 1: Water
Type 2: Fairy
Ability: Mega Launcher
Mega Leonidas Z:

Type 1: Dragon
Type 2: Life
Ability: Ribbon
Mega Charizard Z:

Type 1: Fire
Type 2: Dragon
Ability: Turboblaze
Mega Mewtwo Z;

Type 1: Psychic
Type 2: Fighting
Ability: Ribbon
Mega Lozenge Magus:

Type 1: Life
Type 2: Fairy
Ability: Ribbon
Mega Blaster Blade:

Type 1: Life
Type 2: Steel
Ability: Hard Sword
Mega Zorark:

Type 1: Dark
Type 2: Undead
Ability: Illusion
Mega Greninja:

Type 1: Water
Type 2: Dark
Ability: Hard Sword
Mega Delphox:

Type 1: Fire
Type 2: Psychic
Ability: Flamebody
Mega Chesnaught

Type 1: Grass
Type 2: Fighting
Ability: Iron Barbs
Mega Noivern

Type 1: Flying
Type 2: Dragon
Ability: Ribbon
Mega Flygon:

Type 1: Ground
Type 2: Dragon
Ability: Aura Break
Mega Twinscythe:

Type 1: Bug
Type 2: Dragon
Ability: Hard Sword
Mega Dragonite:

Type 1: Dragon
Type 2: Flying
Ability: Ribbon
more are coming.