Modular Safari Zone/Wild area hybrid: This place has 9-16 tiles that you acquire as you progress its development. Each tile is a large portion of land that you can mix/match on a grid like the safari zone in hgss. Catch Pokemon, do raids, unlock more tiles, and complete challenges to see different mons appear in and out of this area.
Legendary Trainers:100 of them. Each has a team of 6 and gives you high quality items and clues on where to find another trainer.
Battle Frontier: Returns w/5 facilities. Battle Pyramid, Battle Factory, Battle Arcade, Battle Tower, and the centerpiece, The Pokemon world tournament(It includes every gym leader/E4 member/rival/MC/notable character from past gens).
Looker missions: Help Looker solve crimes in these post game missions. (Around 15 different cases to take on.)
Postgame Legendary Story:
After completing the main game, the box legendary takes centerstage as a full fledged plot involving it takes place. This would be respectable length and beating it would allow you to catch even more legendaries from past gens. Each individual legendary would have a good bit of lore and some puzzle solving to find it. Arceus and Mew/Mewtwo would get full fledged stories.
