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>THREE rounds, first 2 have set Pokémon teams, last one has a pool
>return of all classic rulesets (Nintendo, Baby, Prime)
>currency/point system for items in game and also continues
>new Gym Leader Castle, no E4 members but ALL gym leaders are in with Stadium teams that try to balance their typing and not PWT style teams, new mode where you fight 8 gym leaders with rules depending on their region (ex. Hoenn leaders do double battles, Unova leaders do monotype battles only)
>all rivals come back too, you challenge one after every gym leader castle run
>online battles
>Mt. Battle only with the randomness of the Battle Tower every reset, so that you can still beat it if you know what's coming but you can reset it when you win so it's replayable a bit more
>training area akin to Poké Pelago
>rentals that aren't shit in terms of moves, lower stage Pokémon have their hidden abilities though
>online battles and brackets
>arena lobbies
>prizes for official bracket tournaments, including Pokémon with new experimental abilities called Techincal Abilities
>post-launch balancing and tweaking
I seriously hope you meant 3 as in it came out today and not in Ruby/Sapphire since Colosseum and GoD were basically Stadium 3 without the rentals.