This is a battle I created originally for my "Final Fantasy: Eve of Darkness" hack. I know from a lot of people that it's considered very difficult and it just so happens that you have to beat a line-up of other tough bosses to get to Emerald Weapon, so I decided to upload Emerald Weapon all by him self.
While you can still go and play this exact version in Eve of Darkness, I've included a new character that significantly helps in this battle. I've included Bartz from FFV. :)
Bartz can use every item, and every ability. I made the Emerald Weapon sprite with the help of PartyMetroid.

I will be creating a Ruby Weapon battle very soon, and I'm not done working on the second episode of Eve of Darkness either! :)
I have beaten Emerald Weapon with a minute to spare, he is possible.

このゲームとは、『ファイナルファンタジーVI』の改造であり、敵手としてエメラルドウェポンが含まれています。このゲームのニ ューキャラはセシルや、カイン、ブーツ、クラウド、ジタンなどであります。セシルは「あんこく」、カインは「ジャンプ」を使うこ とができます。ブーツは全てのアビリティおよびアイテムを使えます。クラウドは自身のリミット技を全部使うこと、ジタンはトラン スすることができます。ごきげんよう！

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Download
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http://users.sephiroth.ws/Zemious/emerald%20weapon.zip (less info)