final fantasy tactics

has any on got that dark night code to work the one that you become one

There is no way to become a Dark Knight, unless you use gameshark.

why does it seem that no matter how many times people say it there is always someone who hasn't heard that Non of the playable characters can become a Dark Knight without Game Shark?

It is shown everywhere on the internet that you CANNOT get it no matter what you try. Only with Game Shark.