you defeat team plasma and get the national dex,then battle alder
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Complete the Unova pokedex (after that coplete the national pokedex)
you need to find 210 Pokemon to complete the pokedex
There is only one legitimate way to complete the Sinnoh Pokedex. To complete the Sinnoh Pokedex you must trade for the missing Pokemon with Pokemon Diamond, Pearl or Platinum.
There are 300 Pokemon in the Pokemon Black 2 and White 2 Unova Pokedex.
First complete the sinnoh pokedex, 210 Pokemon