First, get into a battle (you should us a garment grid without many dress spheres, like unnering path). then, change dress speres (in battle) until all lines are blue. After that, press L1, so R1 and finally, X. you will now change to either floral fallal, machina maw or full throttle, depending on wich character you're changing dress spheres with.

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How do you use the special dressphere?

wen in battle use a garment grid like unnering path(2 get this garment grid go to macalania woods where auron from ffx chopped down a tree thing and u find ur first
jecht sphere talk 2 trommel until he gives u it along with paines special dresspere)
and change into the other dressphere(s) and R1 and then L1 and x vwoolla