Will try to update as soon as we get more info
Mega Sceptile
Type: Grass/Dragon
Classification: Forest Pokémon
Height: 6'03" / 1.9m
Weight: 121.7lbs / 55.2kg.
Ability: Lightning Rod
Mega Swampert
Type: Water/Ground
Classification: Mud Fish Pokémon
Height: 6'03" / 1.9m
Weight: 102.0kg.
Ability: Swift Swim
Details: It gets a boosted Attack stat
Mega Slowbro
Type: Water/Psychic
Classification: Hermit Crab Pokémon
Height: 2.0m
Weight: 120.0kg.
Ability: Shell Armor
Details: It has boosted Defense and Special Attack.
Mega Sableye
Type: Dark/Ghost
Classification: Darkness Pokémon
Height: 1'08"
Weight: 354.9lbs
Ability: Magic Bounce
Details: It has an increased Defense and Special Attack stat, but decreased Speed
Mega Altaria
Type: Dragon/Fairy
Classification: Humming Pokémon
Height: 1.5m
Weight: 20.6kg
Ability: Pixilate
Details: It gets an increased Special Attack & Attack stat, as well as a boosted Defense.
Mega Metagross
Type: Steel/Psychic
Classification: Iron Leg Pokémon
Height: 8'02"
Weight: 2,078.7lbs
Ability: Tough Claws
Details: Mega Metagross has a greatly increased Speed stat, with additional increases in its Attack, Defense, Sp. Atk, and Sp. Def, making Mega Metagross primed for both offense and defense.
Mega Lopunny
Type: Normal/Fighting
Classification: Rabbit Pokémon
Height: 1.3m
Weight: 28.3kg
Ability: Scrappy
Deatils: It gets a highly boosted Attack & Speed stats.
Mega Audino
Type: Normal/Fairy
Classification: Hearing Pokémon
Height: 1.5m
Weight: 32.0kg.
Ability: Healer
Details: It has boosted Defense and Special Defense.
Mega Diance
Type: Rock/Fairy
Classification: Jewel Pokémon
Height: 3'07" / 1.1m
Weight: 61.3lbs
Ability: Magic Bounce
Details: big boost to its Speed, as well as boosts to its Attack and Sp. Atk, while experiencing a reduction in its Defense and Sp. Def
Mega Salamance
Type: Dragon/Flying
Classification: Dragon Pokémon
Height: 1.8m
Weight: 112.5kg
Ability: Aerilate
Details: It gets a highly boosted Defense stat.
Primal Groudon
Type: Ground/Fire
Classification: Continent Pokémon
Height: 16'05" / 5.0m
Weight: 2203.9lbs / 999.7kg
Ability: ???
Details: Primal Reversion boosts Groudon's Attack, in addition to giving it a new type
Primal Kyogre
Type: Water
Classification: Sea Basin Pokémon
Height: 32'02" / 9.8m
Weight: 948.0lbs / 430.0kg
Ability: ???
Details: This Primal Reversion boosts Kyogre's Special Attack