You can only get this in Episode 7, in the Royal Tombs in Alubarna during the final boss fight with Crocodile. You need to get Crocodile's health down to 1/3. Each time you deplete a 3rd of his health, he'll use his Ground Death technique to destroy the room you're on a little at a time.
Crocodile will try to get you with his Sables attack, which will draw you in. In each corner of the ruins, you'll see a tall pillar with a blue vertical stripe. Hit R2 and aim for the top of the column once you get close enough to it. This will trigger the event attack: Press X once, and then you'll need to rotate the left analog stick counter-clockwise until the blue bar below the pictures analog stick fills up (I recommend using your palm to make it spin faster).