Have masterball ready (since it'd be worth using) save before it, and soft reset (L+R+start+select) after you engage each time until when it comes out it is shiny (1 in over 8000 are shiny, so it might take forever) I am currently working on SRing for it myself, 6-7 hours into it. Good luck.
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Absol is the Pokemon before Giratina. Absol's number in the pokedex is 209 and Giratina's number is 210. This is the one in the Pokemon platinum POKEDEX.
its Giratina's Origin Forme
You cannot rebattle legendary pokemon. (Correction, Giratina is on Platinum ONLY)
...shiny Pokemon are always shiny... ._.
if you mean star pokemon, giratina