Sorry for asking, but isn't that command working in any of those non hacked ROMsets?
Does it work for any of them?
About that "K.I." requirement... I don't remember anything about that, but commands to enable them are correct.
Go to RANDOM and do these sequences:
* For Iori: [Hold START] + [→←↖↑↗→↘↓↙←]
* For Kyo: [Hold START] + [←→↗↑↖←↘↓↙→]