The only way is to beat the elite four then check again. Same with other Pokemon, like if you beat suicune and then beat the elite four, suicune will be at the burnt tower, the place where you first saw it, and you can try to catch it again. It only works if you killed the Pokemon though, i know cause i tried to get a second lugia.
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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
It depends it only will revive if you have action replay