Once you have completed the pokedex I think you should try and evolve them all and then get them all to level 100 although its impossible to complete the pokedex without an action replay
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you can find reshiram in the center of unova when you complete the national pokedex
Tornadus is 641st in the Pokedex.
There are 300 Pokemon in the Pokemon Black 2 and White 2 Unova Pokedex.
The National Pokedex of Black or White.
All you have to do is fill the Pokedex completeley. There are some pokemon which you will have to trade from white but you can do it.