There are new graphics and places like Greenwood Town and Azure City are bigger, Azure City now has a dock. Morphic Tunnel has a new room that's accessible after you beat Team Tundra there that has a couple of trainers, North Route 807 is bigger has a few trainers, there's a rival battle in Route 811 and a Team Tundra encounter in a dungeon that's accessible in the Route, Icicles Tunnel was renamed to Mt. Origin and some of it is accessible east of Dordoran City and there's at least one trainer there, Route 815 is home to Tundra Hideout, the fifth and final gym leaders are different, the final gym is now a Dark type gym, Route 818 is home to Lake Aurora where you finish fighting Team Tundra, I believe there's another rival battle in Route 825 before Victory Road, and the Elite Four have also changed except maybe the Champion, the Town Map of Zephyr has also a new appearance. Oh, and Galena Lighthouse is accessible with seven badges, but it was like that in the 2020 version.