you cant catch it you have to get it from a friend that has Pokemon black or get from a gts trade
You can't the only way to get Tornadus in Pokemon White is by using cheats or by trading it from Pokemon Black.
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You cannot,Tornadus is only availible in Black and White.
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.
Tornadus isn't in Pokemon white, so you have to trade from Pokemon black... if you get Thundurus and tornadus, go to the abundant shrine and the third one will be there. i cant remember his name though...
Tornadus is 641st in the Pokedex.
In Pokemon black/white you must have all the badges and catch tornadus/thundurus and get someone to trade the other legendary( ex. if you have white, get someone to trade for a tornadus). Than goto the shrine with both the legendary pokemon in your backpack and landorus will come out of the sky. Save then fight. Source: me got him a long time ago.