Well, he needs someone to feed him some hero drinks, and you need to either cheat/have no life to get all the materia neded (ie, 8 counters, 8 mimes), buuutttt....
http://n.ethz.ch/student/wmartin/look for link that says "beating emerald weapon." It's in Japanese though.
Now, you can probably do this with any character with multi-hit limits... Buuut all their multi-hit limits take too long. Plus, Angermax seems to do more damage total when you pump barret up with Hero drinks compared to say, kotr or omnishlash.
Appologies if this has been posted before, though.
Oh, and I've confirmed that this works. I'd make my own video, but, bleh. I don't know how to workify them darn fancy video editin' tools.