Meteor doing random damage in Final Fantasy ix? Seems legit. Ozma is just fast and his AI is smart and with high speed and magic defense can nearly remove luck from this fight. Assuming you're at lv 99, make sure your speed is capped at least in the mid 30s (based on your equipment setup), your magic defense is around 56-60, and your reflexes are good, you can inflict ozma with poison and slow at the start of the fight. In other words, use a Tent before you do anything on him.
And, dont fight him unless you're max level and have those stats i mentioned