I beat the game with 39 hours of play time and to my suprise I got 5 stars on the last boss. I really wanted this trophy because I like the lightning theme for my PS3 but was the final boss supposed to be that easy to get. The battles before the final boss(s) were destroying me.
So my question is did you get this trophy/achievement the first time you beat him.
If your curious: I used rav,rav,sab until he staggered then I used com,com,rav until he died. I only staggered him once. I ussually can't beat normal enemies in one stagger.