go up and find the spear pillar
No, only in Pokemon Platinum do you get the distortion world.
The Distortion World is exclusive to Pokemon Platinum.
DisToRtIOn WoRLd
It is at Distortion World.
While playing through the story you will end up in the distortion world with Cynthia. in the distortion world you will have to battle Cyrus after beating him Cynthia will heal your Pokemon. then you will be able to find giritina, in the distortion world.
You get it in the distortion world
Yes you're allowed to go to the distortion world again, but you have to go through Turnback cave to find it.
Travel through and keep heading down and push the boulders in the holes that the legendary Pokemon are near.
When You Go To Spear Pillar.
in the distortion world i guess you can also get it underground
No.
First you go to spear piller and then you go through a portal to the distortion world and that's where you'll find giratina the main platinum Pokemon.