I can give you a hint how to unlock hidden skills. if you beat game once and you starting another playtrough talk with people in cities they can help you about this. You can learn how to unlock hidden skills, how to do those special team attacks and other valuable informations...
^You don't need a second playthrough to have the townspeople tell you about these small pieces of information. The townspeople will tell you how to unlock hidden skills, Overdrive combos and team attacks regardless, so if you have a pen&paper ready you can jot everything down.
And yeah, I was relying on the character guide as well. I guess Molovious is reworking it (or whoever the FAQ creator was)?
Well, since that's the only option right now. I guess I might as well jot down the special overdrives/hidden skills/special burst link requirements in this topic as I play through the game. It might help some people until an FAQ gets uploaded. Please note that it won't be very well formatted, and that progress may be slow.
Special Overdrive Sonic Steel - Phantom Step, Envenom, Steal
Special Burst Link Destiny Bond - Champion, Lord Knight, High Wizard.
"Cold water sinks and cold water rise" - A classmate, when asked about convention currents. "Make up your damn mind" - My science teacher.