No. If you haven't saved since then restart and try again, otherwise you missed your shot.
Chat with our AI personalities
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.
no
Yes you can! After he faints go back and he'll be there.
Yes, Azelf will respawn, if you have fled or accidentally faint it, after defeating the Pokemon League.
If you did,just go to the pokemon league then beat the elite four and the champion