mine is a very inperfect one but here it is.

barret and tifa are dead still from ruby but i dont need them. the only things i have is ultima weapon, mystile and sprint shoes.

my materia is KOR 2 stars combined with hp absorb, hp plus max, under water, mime and w-summon.

then its just cast kor twice and mime it. your hp will be restored back to 9999 after each kor. the only flaw in this method is if his revenage stomp does more then 3332(which it rarely does) and he gets a air tam storm after it, you r dead since u it does 6666.

fortnatey this is rare, and his 4 eyes will never get a go, and those were always emeralds real threat. it takes about 11 KORs.

I know there are far better methods but its at lv 81 with little mastering of the best materia on disc 2. and its done with a solo cloud which is pretty sweet.