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.
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Trade from white and if you have white trade from black for tornadous
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.
Thundurus is in White only. Tornadus wanders around after talking to a certain NPC, just like thundurus
Have Thundurus and Tornadus in your party and go to the Abundant Shrine off Route 14. Head toward the open part in the Abundant Shrine. Be sure to bring plenty of Ultra/Timer Balls. For Thundurus you'll have to trade with White.