Much like how the newer generations of Pokemon have seen readjustments in Stats and Moves, so now for abilities in the Seventh Generation to make things a little more balanced.
Ability Changes
Aerilate: The power boost has been decreased from 30% to 20%
Gale Wings: The ability only activates when the Pokémon has 100% of its Hit Points remaining
Parental Bond: Second hit only does 25% of the first hit's damage rather than 50%.
Pixilate: The power boost has been decreased from 30% to 20%
Prankster: When targeting a Dark-type opponent, the move with priority now fails. The move will still work on Ally Dark-type Pokémon
Refrigerate: The power boost has been decreased from 30% to 20%