in the bellville labrinth before u battle yevon prator on chapter 2.there is a little chest on the left side were u jump at.once u see that. go back to were there are 3 lifts.first take the lift on the right then go straight down u will fall down to were the remaining 2 lifts are.take the purple 1 u'll be in a little platdorm go on the step u can climb on then it will pull 2 poles up.then do the same thing to the left side.then jump down to the chest and you got the dark knight dresssphere.hope this help's you.:)