I'm assuming that you're talking about Ultros and Chupon. Ultros is weak against Bolt (I think) and after you take enough hit points off of him, be calls his budy, Chupon, into battle. Once you take off enough hit points off of Chupon he sneezes you off, and you will encounter the Air Force as you fall down. Just use your most powerful magic and attacks on it. If the Air Force summons Speck, be sure to kill it with physical attacks first as it absorbs magic attacks. Once the Air Force is defeated you'll land on the Floating Continent and continue on your adventure.