If you did,just go to the pokemon league then beat the elite four and the champion
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i killed it to i killed it because it was un supected so i had to kill it but the only way to get a legendary Pokemon back is if u beat the elite four again and all the legendary Pokemon that u killed will be maxed revied
I'm pretty sure they go away permanently if you kill ANY type of legendary pokemon. well when i killed tornadus a few days later it came back
If you are referring to ones from previous pokemon games,then yes!You go to the right of the city where you get the final gym badge and in a truck you can find a person that wants to trade her Rotom for a Ditto.You can find one in the cave that leads to Kyurem(a legendary).If you are asking if when you make a legendary faint it will come back,then yes.However,this only works with Victini;an event pokemon.
If you saved before encountering a Legendary, you can soft reset to encounter it again until you find the right one you want, but saving after catching or fainting a Legendary, soft resetting can't bring the Legendary back. It won't mess up the soft reset, but it can ruin the chances of finding a shiny Legendary if you already saved after encountering it.
you dont