Re: Proto Behemoth
I beat him on my 2nd try using normal, not grinded party (3 roles maxed, other 3 @ LVL 50) and maxed Golden Chocobo COM (no infusion!).
The point is to use paradigm Cerberus-X and have the Feral Link ready. When the battle starts pound on the behemoth, when he tries to stand up (25% life left) use the Chocobo's FL. He goes down during his standing up and roaring animation. Then you move on to the two cats.
Never heal, never change paradigms, never attack anything other than the Proto Behemoth. Don't try to stagger him - try to kill him.
I used this tactic 3 times and killed him 3 times (out of 4 battles), still no crystal drop so I moved on *shrugs*.
Final battle is fucking hard to 5* though. Managed to get only 2 stars on Normal (11 minutes). I guess I need to level up my LVL1 Pulsework Guardian SENtinel, lol, cause he was dying all the time during that battle (Gigaflare).