Omega Weapon is too easy. All you need to defeat him is high speed, limit breaks, and defend. I wish this game was more challenging, it's hard to feel ultra cool beating the game when you know that unless something goes terribly, terribly wrong, there's no way you will lose.
Angel Wing just defeated Omega Weapon before he even got the chance to use Terra Break.
I remember when I beat Omega Weapon when I was 12 using only Invincible Moon, Lionheart, and incredibly lucky Angelo Reverse and the Phoenix summon. That was cool (My characters were scrubs).
Anyways, what battles were actually challenging for you guys? Assuming you didn't pimp out your characters.