You start in twinleaf town where you will be given a chance to customise your own character. The beginning scene is a panning camera that follows to a mirror (this is where you will be able to create your character.
You watch a 20 minute Cutscene involving team galactic
The game and town designs are akin to platinum. A lot more emphasis on snow
Pokedex is slightly more varied. (No national sex)
Some sinnoh mon's are omitted. There is no rypherior or togekiss because they were in Sword and Shield.
My Coronet and The Underground are more simplified (but fans will still like them)
There is no wild area. But there is overworld encounters
There's also following Pokemon
There are clothing shops. However, the options are almost the same as Sword and Shield
Graphically, it's more impressive than Sword and Shield. No tree problems this time
You will given Johto starters during postgame.
The soundtrack feels more jazzy.
Giritina is left to the postgame
Exp share is still baked in
Elite 4 returns
No raids