I know there are some categories in some games where emulation is allowed. Why not a category for this game, or any game really?

So is it allowed or not? I entered this forum for answers. I'm not even sure if I can't use an emulator for this. If it is allowed, which version officially?? I want a separate category for emulator based versions of all speed run rule sets. Some games on here like Ocarina of Time do allow some speed runs to have emulators on it. But here doesn't specifically say you can unless you submit a speed run like what @theballaam96 said. If we cant use emulators, why not?