the best way to get wings of discovery is to train in omega ruins with gillionaire ability (you can get this from rikkus celestial weapon). Try and find as many mimics as possible, they give you 100,000gil each time you beat them with gillionaire ability. BTW there is no armour that starts off with break hp limit ability, so i think anyway?
i find the best way to get wings of discovery is with Great Malboro's, since u pay them 1,600,001gil and i usually get 9 wings of discovery and when i gave 675,000gil to a normal malboro i only got like 3, so save before you fight the great malboro in the monster arena and if you dont get alot of wings of discoveries from the great malboro , reset and try again


EDIT- according to my european edition to bribe a malboro its like 675,000 gil and i only got 3 for that