It looks like Tentacool's page is the only one that updated though. All the others listed for Lilycove City don't say so on the Pokedex page. Staryu's page says to trade or migrate as the OP mentions. I checked Google's cache of the pages from over three days ago and the entries are missing there too, so it can't be a 24 hour refresh.
Is it worth looking into now, or will it just update in due time?