>>45434520Re-added animations, redid the entire villian arc with a new base for magma, more challenging gym leaders, a better regional dex, both box legends available, way more double battles throughout the campaign which was a selling point of gen 3 to start with, faster breeding with field abilities, gym leader rematches.
Emerald is a much better experience throughout the campaign and I didn't even mention the battle frontier yet, which yes, adds substantial postgame unlike RS which did nothing more than redo Crystal's one battle tower.