I’ve never beaten Emerald Weapon, I usually last about ten minutes against it in battle but after that I tend to die very quickly. Last time I fought it, it separated the top half of it’s body from the bottom, started to hover over my characters and hit them with what looked like a wall of light. That did 9999 damage to Cid and Yuffie killing them immediately. It missed Cloud but before he could revive the others he got hit by Emerald Shot and was killed.
I need even more help when it comes to fighting Ruby Weapon. I don’t even know how to hurt it! Last time I fought it I hit it with Cloud’s Omnislash which did nothing, then it used Whirlsand and removed Cid from the battle. I hit it with Yuffie’s All Creation which did nothing, then it used Whirlsand again and removed Cloud from the battle. Then before I had a chance to do anything it used Ultima and killed Yuffie with one hit. So in total I probably lasted about a minute or two against it most of which was taken up by Cloud’s Omnislash.
Ruby Weapon: Have Cloud alive at the beginning of battle, kill the other two before entering, it sounds dumb but… then, at the start of the battle it will raise its arms from the sand and you can damage it. For Materia: W-Summon paired with KOTR, Last Turn paired with Phoenix, mime. Then W-Summon KOTR, Ruby counters with Emerald but I had a good Cloud do he evaded it all but once, and the one time he didn’t it only did like 6k, and in the worst case you’ve got last turn materia to revive you entire party, so W-Summon KOTR, mime evertyime voila, you win! =) . Hope this helped.
EDIT: Change the word’s Last Turn to Final Attack.
1. Kill off the two characters you dont want.
2. Use Dazers to paralyze him.
The attack is called "Air tam stomp" – it deals 1,111 points of damage for each materia a character has equipped, so the trick is to have 9,999 HP and less than 9 materias equipped – W-summon, KotR, Mime, Final attack, Phoenix – and some others if you wish.
i didnt know you could counter with limits