Roughly Which Bahamut Raid Requires A Premade Group?

[DoctorPepper]

T5, T9 and T10+ should have a premade group, you might get lucky in DF with T5 but probably not. The rest can be done in DF but will have a higher fail rate of course as opposed to say.. joining a premade farm group.

You need to complete T5 before you can enter T6-9 and then complete T9 before you can enter T10+. If you can't make a static look for learning groups in PF for the ones I mentioned above. Once you've learned all or most of the mechanics look for clear groups that don't require the win or say farm.