Where to find Graviton Core Gamma | Final Fantasy XIII-2 Fragment Guide (#58)
Fragment Guide | Graviton Core Gamma (#58)
Oerba (200AF) - Graviton Core Location Guide
To snag this Graviton Core you're again going to need a Chocobo, this time in Oerba (200AF). Grab one down by the beach, then return to the area near Chocobocolina. Take the ramp up towards the big tree, then bear immediately left to find a small sandy ramp. Jump off it to land atop the trailer-like house beside Chocobocolina. Hop off and use the Moogle Hunt ability to find Fragment of Time #58 - Graviton Core Gamma.