Re: What are the 4 orbs for?
First of all, it's the Shadow Triad, and they give you 3 orbs.
An Adamant, Lustrous, and Griseous Orb. The Adamant Orb is to be held by Dialga, its Steel and Dragon type moves increase by 20%. The Lustrous Orb is held by Palkia, increasing its Water and Dragon type moves by 20%. The Griseous Orb is for Giratina, boosting Ghost and Dragon type moves by 20% and it also has the feature of allowing Giratina alternate into its Origin Forme when being held.