Ghost / Dragon
The Pokemon raises the foe's PP usage.
The user distorts reality around it, confusing the enemy for the remainder of the fight. Each turn also has a 10% chance to inflict a status change.
After both the temporal and celestial towers were destroyed, and Dialga and Palkia had been forced into Primal Reversion, the resultant shockwave rippled through all of reality, forcing Giratina to undergo the process, causing great pain to the Pokemon.
It has one purpose which it cannot be dissuaded from... destroy all of reality in all dimensions. Including its home, the distortion world.