I’ll go take a look now 
Stupid fucking Magus Sisters keep killing my ass.
EDIT: Nope can’t get it, guess I’ll have to wait for New Game+
EDIT2: Thanks guys, now because of 2x Trigger Happy Level 3 and Strength 109 and a two chocobo feathers I finally beat em.
It’s not impossible to get the Dark Knight dress sphere. If the platforms are missing, then you’re missing something with the transporter thingies… that one confused me at first, too. Just go back, and make sure you’ve done absolutely everything you can with them.
iv beating the game like three times now and i still cant get that stupid dark knight sphere.
oh im not sure if your still talking about chains but i know a pretty good one. teach all the girls firaga,blizzaga,and thundaga. then during battle while there all black mages make each of them all cast blizaga,firaga,or thundaga at the same time. its really hard to get the timing right but if you do get it right they will all cast there spells simulatiosly this does a shit load of damage.:moogle: