Salandit, the Toxic Lizard Pokemon. It's a Poison/Fire type with the ability Corrosion, which allows it to poison even Poison and Steel types which are normally immune.
The bear is called Kiteruguma and is Normal/Fighting with the abilities Fluffy and Klutz. The ghost is Mimitsukiyu and is Ghost/Fairy. It has the ability called Disguise.
More new ones, including a ghost/ground sandcastle, dark alolan meowth, fire/ghost alolan marowak too.
Also we finally see the antagonists of Sun and Moon - Team Skull. You can see the grunts below the pink haired admin lady in that pic, they look like a cross between Neo Team Plasma and Team Aqua.