I caught it with a Preimer ball. Luuucky. It's like catching Giratina in a Poke-ball...but you only get one of these every game. O.o
I threw it by chance. And I think it fits him well, probably just as well as any Dusk Ball would. Giratina pops out with 6 or 8 red-and-silver orbs floating around him. It's cool. :D
Masterball. I...'twas lazy. ;)