It depends it only will revive if you have action replay
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No.
NO it doesn't
it wil never come back...
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
No it will not come back because it's a legendary Pokemon and there's only one of themActually it does come back. You have to wait a week and he will be there again to battle you.ACTUALLY, THE POKEMON DOES NOT COMEBACK UNLESS YOU RESTART YOUR GAME.