Learn Limit Skill "Great Gospel"

You must bring some Mythril to the blacksmith near the Gold Saucer. It can be easy in disc 2, but if you want it to be useful, you must get some in disc 1. For that, you’ll need to bring the buggy back in the first continent, which is achieved by driving it to Costa Del Sol and taking the boat back to Junon. Then, drive your way back to Fort Condor, and cross the river northeast of it to reach a small cave. In there, a man is sleeping, and mumbles when you speak to him. He’s actually telling you the number of battles you fought, and how many you ran from. When the number of battles ends with the same last two digits (like 66, or 233), he’ll wake up and give you some Mythril. When you bring the Mythril back to the blacksmith, he’ll allow you to open one chest. Go up the the second floor of his house, and open the little box in the wall corner.

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