Ok, from what I read I think since you already have the blossom crown and flower scepter that before you get the magus sisters you need to get Anima first, once you do you can fight him too at Remiem and you should them be able to get the Magus Sisters and in turn fight them there too. To get him you need to have gotten all the destruction spheres from the Temples, luckily you get Bevelle's automatically if you miss it so don't worry to much about that one. Once you've done that (maybe you have already) you can go to the Baaj Temple to get Anima. The cutscene is really cool!
Good Luck!