Ozma is a pushover compared to the rest of the challenge. You'll have him beat within 10 tries, the problem is that getting up the Chocobo Air Garden 10 times in a row can be annoying. My suggestion to you is to find the Air Garden's shadow somewhere and save right by it where you can see it from the place you save. If you die, keep resetting until it's there again, that saves you tons of time flying all over Gaia trying to find it again. Basically you want to be like the person who looks at a building and says, "I don't know if there is a builder."