This is The origin forme of the renegade pokemon Giratina. It can be found in the distortion world where it watches the real world silently. It was banished by Arceus for its violence.  It is the mascot pokemon for Platinum version. To transform it into altered forme, you either have to remove the Griseous Orb or return to the normal world. It has the ability to travel in a dimension between time and space. it is a part of the creation trio representing antimatter.

This is the altered form of the renegade pokemon Giratina. It can be locate in turnback cave, found at the north of the sendoff spring. Turnback cave is a maze filled with fog and randomizes the rooms everytime you enter