HMs such as cut have had their typing changed and BP boosted
A few moves themselves have been edited in terms of accuracy, type and BP. A lot of Pokemon have had their level up moveset edited to either match that of ORAS or improve those who didn't have a great moveset to begin with. Many Pokemon have had their stats slightly edited to make them comparatively viable to use Some have also had their typing edited such as Golduck who is now Water/Psychic. Pokemon who had comparatively non-beneficial abilities have been given a new set entirely Most Pokemon now have easy access to their Hidden abilities. All previously unavailable Pokemon are now included - Eg Rattata. All 721 Pokemon available in one play-through - every area has a lot more variety to offer. Pokemon (See documentation for detailed information)