It depends on the game. The easiest thing is always to restore a save from right before the fight.
In Diamond, Pearl, and Platinum, you can run from the battle and it should be there when you come back. If you make him faint, it looks like he might be gone forever. You can either load whatever save you have, or trade for one.
In later games, often fighting the Elite Four will make legendaries reappear, or just waiting a day and re-finding the mirage spot where it appeared before.
He Didnt "capture" gliscore. He evolved is Gligar :]
don't capture Gratiana with the master ball that you get from team galactic leader instead keep the master ball and go to see heatran after Pokemon league and use master ball on heatran and catch him instantly
it takes 15 turns for it to take effect so I would say 20-25 turns.
heatran
Nothing evolves into Heatran nor does he evolve
You must have the National PokeDex to capture Heatran.
stark mountain
You have to capture Heatran.
heatran just beat Cynthia again and he will be capturable now if you do capture heatran .well fill up your national pokedex
He Didnt "capture" gliscore. He evolved is Gligar :]
You get him by finishing the pokedex and goin to the top of stark mountain
put in the "SHINY WILD" CODE for ACTION REPLAY AND IT MAKES YOUR POKEMON SHINY TRAINERS POKEMON SHINY AND WILD POKEMON SHINY GO TO HEATRAN AND CAPTURE IT
After you capture/defeat heatran they start roaming sinnoh
don't capture Gratiana with the master ball that you get from team galactic leader instead keep the master ball and go to see heatran after Pokemon league and use master ball on heatran and catch him instantly
to get a heatran, you have to of been to the battle grounds (bucks grandpa owns it) in the survival area then you go to the strak mountain and then you travel through it with buck until you get to heatrans cavern, then you find him and will have to battle him.
Beat her more times or capture Giratina on the Spring Path in the back of Turnback Cave. Or go find Buck and then go to the end of Stark Mountain to capture Heatran. For Giratina get Ultra Balls and for Heatran get Dusk Balls or Ultra Balls. Have FUN!!
if you haven't been to the resort area, go there, but if you have, just continue your quest to complete the national pokedex.