You will need the Griseous Orb in order for Giratina to change into its Origin Forme however it cannot be found in Pokémon SoulSilver, you need an event Arceus in order to access a special in-game event near the Ruins of Alph so that you can get Giratina from it.
Giratina Its called Giratina Origon Form come to my site for help www.KgonEhti.webs.com
You can't change Giratina's form in Pokemon Pearl (that includes Diamond). You can change Giratina's form in Pokemon Platinum (that includes Heart Gold and Soul Silver). You can change Giratina's form with the Griseous Orb. To change Giratina's form give Griseous Orb to Giratina and then take it off and Giratina changed its form.
you can't
To change Giratina's form to the form where he has no legs give your Giratina Griseous Orb. To get this orb in Platinum you go to the Distortion world. In HeartGold and SoulSilver, the Giratina you get from the Sinjoh Ruins holds one. In Black and White, the Shadow Triad gives it to you at Marvelous Bridge.
They change deoxys form
You can't change Giratina's form in Pokémon Diamond or Pearl, you can only change it in Platinum, HeartGold and SoulSilver.
you cant but you can in explorers of the sky by getting giratina's special orb
You can in Platinum, but in Diamond and Pearl, the item does not exist and the Giratina cannot change form. In heartgold and Soulsilver you can also give it to Giratina, but whenever you try to trade it or enter certain rooms it will revert to the original form where it is not holding it. It may be also that you may not give it to a hack pokemon, but i don't know for certain about that.
You need a Gracida Flower.
Giratina Altered Forme is a character form from the popular Pokemon game series. It is actually Giratina's altered form.
You'll need to let it hold a Grisious Orb.
Giratina's origin forme is not present in Pokemon Diamond only it's Altered forme. Whilst you can still attach the Griseous Orb to it, it will only boost Giratina's stats ,not change it's form, to do that you need to play Pokemon Platinium.