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Main campaign
>Non linear path with minimal narrative. Gyms scale accordingly
>Over 100 new mons with a 300 to 350 dex size
>Rivals work like optional bosses where you don't have to beat them to progress until a certain point. So in return, they are very tough to beat.
>Victory Road is replaced with a League format similar to the anime.
>Player gets key items in place of riding pokemon and hms. Such as a raft, axe, flash light.
>There are also vehicles like boats, buses to traverse the region to places you explored
Post Game
>Versus calls where certain trainers you defeated without taking damage call you up for special one on one battles. They give you a random move tutor if you defeat them. The tutor is better the stronger the trainer was. Can range from champions to first route npc.
>Special festival plaza with all the side mini games from previous games. Includes contests, musicals, pokeathlon, poke stars studios, etc.
>Memory link returns, allowing you to sync up all DS and upwards pokemon games to the new game.
>Enhanced PWT with extra rulings from Battle frontier like rentals. Includes all major characters, from protagonists who's teams are based on your memory link file to even certain team bosses that are available. (No Cyrus, Ghetsis, or Lysandre for one)
Megas
>Give megas to the remaining starters, pseudos and to more gen 4, 5 and 6 mons.
Miscellaneous
>Animated cutscenes in place of 3d ones. And include voice acting in them
>Have all future credits work like ORAS, showing key moments with your pokemon during your adventure
>PC management can be done anywhere on the map
>Eggs can hold certain items. Some can even speed up the process of hatching without taking a step
>Nickname pokemon get a different hue like in the Stadium games
>Trainers react to their pokemon getting attacked
>There's an option in the PC management to class pokemon in alphabetic, height, weight and dex number. This makes pc management far more convenient