POSTING ALL THE INFO AT ONCE BECAUSE I AM HYPED AS FUCK
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New Pokémon and Mega Evolutions

Mewtwo will receive two Mega Evolutions.
Mega Mewtwo X receives Psychic/Fighting typing, along with the Steadfast ability
Mega Mewtwo Y is Psychic Type and learn Hypnosis
MewtwoniteX and MewtwoniteY are the two Mega Stone used to Mega Evolve Mewtwo
Hariboogu is Chespin’s evolution, remains Grass Type and learns Mudshot
Teerunaa is Fennekin’s evolution, it remains Fire Type and stands on two legs with a tree branch stuck in its tail. It can learn Psychock
Gekogashira is the evolution of Froakie. It is Water Type and becomes ‘slender’, it can learn Bounce
Garchomp receives a Mega Evolution, it has the ability Sand Force
Torimian is said to be the white dog we saw in the Pokémon Direct broadcast. Is it Normal Type. It has the Fur Coat ability that halves the damage done by physical attacks. Tormian learns a Fairy Type move called Puppy Dog Eyes, it seems to involve pressing the A button and lowers the opponent’s attack. The Pokémon changes colour and it appears you can change the appearance of the Pokémon.
Chigorasu is a Rock/Dragon fossil Pokémon, it has the ability Hard Chin which increases the attack power of moves like Crunch, presumably it power up moves the use the Pokémons mouth
Amarusu is a Rock/Ice fossil Pokémon
Nyaonikusu is a Psychic Type cat Pokémon, it said to have both male and female forms (these differences are also apparent in the moves the Pokémon can learn - female is more aggressive, while male offers support), as well as either the Infiltrator or Keen Eye ability. The male uses Miracle Eye, while the female uses Extra Sensory
Flabébé changes the colour of the flower it holds according to where you are
New Abilities and Moves

The Freeze Skin abilitymakes any Normal Type moves the Pokémon uses change to Ice Type, and also boosts their power