Gallade Roxas wrote:
I think it's in one of the secret item rooms in the Ruins of Alph.
I'm not positive it's the Life Orb, but I remember getting some Orb from there...
Specifically, inside the fourth chamber of the Ruins of Alph. This chamber can only be accessed through Union Cave. If Ho-oh is in your party and you examine the back panel, it will open up and you can obtain the Life Orb.