No, Tornadus cannot evolve in Pokémon Black however as of Black 2 and White 2, it is capable of changing forms.
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You cannot,Tornadus is only availible in Black and White.
you cant catch it you have to get it from a friend that has Pokemon black or get from a gts tradeYou can't the only way to get Tornadus in Pokemon White is by using cheats or by trading it from Pokemon Black.
The only way to register Tornadus in your PokéDex in Pokémon White is by arranging a trade with someone that has Pokémon Black and has caught Tornadus.
Once you kill Tornadus, you have two chances. Since it is a legendary Pokemon, there is only one of its kind, and will appear after the first one.
Tornadus is a Flying type pokemon.