>>46066118>Outbreaks happen daily for locations all around SinnohBW has that too
>Pal Park is now open for importing PokémonBW has that too, although the minigame is arguably worse
>If you bring in the Regis, you can do Snowpoint Temple and battle RegisteelYou're technically correct, BW's optional "bring Pokemon here for an event" is during the main story
>Route 214 gets the Spring Path which leads to Sendoff Spring which leads to Turnback Cave which lets you catch GiratinaBW has two postgame legendaries
>Save Sailor Eldritch's son by going to Fullmoon Island to get a Lunar Wing and to get Cresselia to roam SinnohSee above
>Darkrai event with Members Card and Newmoon IslandVictini event, although given it was basically a bonus for early adopters and scaled for early game, I dunno if that counts
>Shaymin event with Oak's Letter, Seabreak Path, and Flower ParadiseBW has an in-game event for Meloetta, but that really has more to do with GF not wanting another Tweaking problem,
>Arceus event with Azure Flute and Hall of OriginNot even real, dude
>Super Rod obtainable for new PokémonBW literally only allows you to get a rod at all in postgame
>The entire Battle Zone (Route 225, 226, 227, 228, 229, 230, Battle Park, Battle Tower, Fight Area, Survival Area, Resort Area, Stark Mountain with the Buck sidequest, tons of new Pokémon)Eastern Unova (Routes 11-15, Lacunosa Town, Undella Town, Black City/White Forest, Village Bridge, Marvelous Bridge, Undella Bay /Abyssal Ruins) has about as much content, although admittedly the Battle Tower equivalent is part of the main game.
This also is ignoring the Relic Castle event to get Volcarona, the Royal Unova which has both battles and charm, and the fact that White Forest covers a shit ton of Pokemon that you might not want to use because they're too low level. But Sinnoh does have the new postgame Pokemon more broadly distributed in more methods, generally speaking. I do miss the VS Seeker, the stadiums aren't enough.