Mega forretress

Ability: iron barbs

Mega ribbombee

Ability: pixilate

Mega typhlosion

Type: fire/dragon
Ability: explosive force (New!) (it's tough claws but for special moves instead which basically means any move that doesn't make contact has increased power but takes away some of his hp)

Mega feraligator

Type: water/steel
Ability: thick armor (new!) (steel/rock/ground/normal moves deal less 1/8 less damage)

Mega meganium

Type: grass/fairy
Ability: regal stature (new!) (when this Pokémon is brought out, the weather goes back to normal and no Pokémon may take any other action other than attack)

Mega noctowl

Type: flying/fairy
Ability: time keeper (New!) (this Pokémon will recycle any berry it has eaten after 2 turns)