Yes, in the event of defeating Thundurus in a battle, it will respawn once you have defeated the Pokémon League Champion.
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No.
NO it doesn't
it wil never come back...
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.
nope sorry dont listen to the top one heres the real one: basically if you kill it you can go to the pokemon league and beat it and when you come back to the giant chasm you can see kyurem and give it another shot