Yes you can, but i suggest u catch him with dusk balls.
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26 ultra balls and about 10 dusk balls with lvl 65+ pokemon
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!!
A master ball is a great choice always but personally I would recomend to save it for later. Some other good options are using ultra and dusk balls. You can also try your luck and use great balls (I wasted 4 pokeballs and 7 greatballs on catching my Giratina).
i catch them with poke'balls,ultra balls,time balls,premeir balls,all kinds,but that's me....................
yes but you need 50 ultra balls