This might be a bit old but...
Pokemon Reborn > Graphics > Pictures > badges
The first 9 badges that we've obtained so far in the game match the order of the first 9 badges in that picture, so assuming the order in this picture is correct for the remaining 9, the gym leaders left to face should be, in the correct order: Samson, Charlotte, Terra, Ciel, Adrienn, Titania, Amaria, Hardy and finally Saphira, unless Ame kills one of them again. It's interesting to note how Hardy comes a lot later than expected, the fact that Titania is followed up by Amaria (because there's a scene shown in Shade's gym of Titania pushing Amaria and killing her) and how Charlotte comes quite early. We should expect to see the circus trio in episode 12 and in the next one we might meet up with Charlotte, Saphira, Laura, Shelly, Noel and Anna again.