Pokémon NEO X & Y contains a variety of changes to the Pokémon. Most Pokémon now have easy access to their Hidden abilities or have been given a new set entirely. Many Pokémon have had their stats slightly edited to make them comparatively viable to use; some have also had their typing edited.
A lot of Pokémon also have had their level up movesets edited to either match that of OR/AS or improve those who didn’t have a great moveset to begin with.