Need help with event flag.

Hello everyone, yesterday I was playing the semi-translated FF6 T-Edition and I intentionally skipped the Shoat (defeated) and Carbuncle battles that took place after the first fight with Kefka, and now I'm right before the Floating Continent. It ocurred to me to watch the Poemato's walkthrough of the hack to see if I missed something, until I saw this.



How can I do to make those three npc to appear in that place to fight Carbuncle, as he did in the video, when they were already gone? I have no idea about hacking/editing roms. In the video he's at the same point as I, with the difference that I don't know how to do the thing that he did.

I tried to use FF6LE but this happens: 
         
I'd really appreciate if you help me, thank you for reading.