You don't destroy it. You can either catch or defeat Girantina at the end of the world.
disortation world
catch one.
You can't
you cant. you have to go to the platnim event
it is Tentacruel
Beat or catch Girantina
you have to trade him and trade him back
snowpoint city
No, only pass the part with Giratina. You don't have to catch it. U can still catch giratina in disortation cave.
you get it for a man in the cave before the first gym
No but transfer the lushus orb from Platnim Put it on lugia and Shadow lugia!!
In theory, you can't destroy something and then destroy it again...