you have to go in and out of any of the route's gates and then a nasty thunderstorm will start. Go in the grass (not the dark grass) you might find a Pokemon so you have to it all over again
HINT: Thundurus will want to flee so use mean look or something like that so he won't flee
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Trade from white and if you have white trade from black for tornadous
Get all badges and go to Route 10. Then go to Route 7 and go to the second house. After leaving. You will find Thundurus. He is a roaming Pokemon.
You cannot get Thundurus in Pokémon Black, the only way to get it in Pokémon Black is by arranging a trade with someone else in order to get Thundurus. Thundurus is a Pokémon that is exclusive to Pokémon White however its counterpart, Tornadus is available in Pokémon Black.
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...