Pokemon Go: Giratina Origin Forme Debuting Next Week - GameSpot

Giratina is making an encore appearance in Raid Battles from March 28 to April 29, and this time around players will have a chance to capture its Origin Forme.
Pokemon GO is a new project for mobile devices that encourages fans to search far and wide in the real world to discover Pokemon.

News - June, 2015

Pokemon Go: Giratina Origin Forme Debuting Next Week - GameSpot

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Giratina Origin Forme Advanced Raid Guide Infographic by Team gtr-Storm : r/TheSilphRoad