So, if you are not using tms take in mind that you HAVE TO USE ITEMS. You can be very Lucky Of not using it but a normal party should use ítems.
Scarmiglione: fire weakness. Attack it without taking his hp under 50% or he Will transformación and fuck you hard. In the second attack you must know kill it.
Rubicante: ice and water weak. Same as sacarmigione but you can barfira or barfiraga ig you have a cerius
Cagnazzo: ice weak. You can fuck him in turn one. When he transform he wont attack but his defense Will rise very very high. Just dispel him and fuck him again
Barbariccia: stone and holy weak. Same as scarmiglione.
Golbeza: i dont study a path for him. Just equipped diábolos on kain and killed it with 2 jumps.
The only tip I can add is:
Scarmiglione - Just cast Raise, Revive or use a Phoenix Down on it to kill it.