You might be a ways away from this. But the level 83 dungeon has Garlean themed gear, so you might find what you're looking for there.

Worst case too, you can also look at just Garlean themed gauntlets (glove armor not weapons) and use The Emperor's New Fists until you get them. Other than that, I would agree with the earlier suggestion of the Sephirot weapon as probably the best choice