I'm serious. That's the best I can go. Golbez is one of those really good characters just off the bat due to his attacks. They have quick start up, and they're just fully block because they aren't just one strike. You may block his slash from his hand, but you could still get hit with the lasers as he's stumbling. So its also hard to counter some of his magic cause it could stun you or at the very least hit you from all sides.
The best thing to do is take advantage of Zidane's amazing speed and air game and look for openings after he attacks or dodges. There are moments where after an attack or dodge he can't move so if you're fast, you can hit him.
Or, stay away from him, collect all the EX cores and when you have a full ex bar go in to fight and if you get caught in his annoying Brv to HP combo where he finishes you off with Cosmic Ray, Ex cancel out of it, and just hit him with free energy. Hopefully that'll kill him if he's not too high enough level, otherwise just go in for the free critical hits and break him.
He can be hard but you just have to play conservatively and not go in rushing, cause thats what the fucker wants.