How do you summon the starflight express in dragon quest ix?

It's post game quest 039, Follow That Fish! You have to talk to Jona Jones and then talk to the ghost of Llevithian's serenader at night. then, go to where you fought Llevithian before, only equipped with a flowing dress, a watermaul wand, and either a silver shield or a silver platter, i forget which. defeat Llevithian, you will get a fygg, eat it, and you will gain control of the starflight.