Nothing happens after you get the National Pokedex, but there are other things to do, such as looking for the Seven Sages, visiting parts of the Unova Region now accessible,...etc.
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Complete the Unova pokedex (after that coplete the national pokedex)
No, it is a version exclusive to Pokemon White. You'll have to trade it from someone who has that version.
you get zekrom in Pokemon white version and resheriham in Pokemon black.(in my oppinion, it should be the other way around, zekrom in Pokemon black, and resheriham in Pokemon white version) IT IS JUST LIKE PUTTING DIALGA IN POKEMON PEARL AND PALKIA IN POKEMON DIAMOND.
The starter Pokemon are Snivy, Tepig, and Oshawott.
IT would HAVE to be Zekrom the legendary pokemon