This sounds interesting!
I think if you wanted to replace a boss with Giga Bowser, such as Rayquaza, then ur idea might be possible. but as far as the fighting pattern, i'm not sure how you could modify it. I think you probably could replace a boss, but doing it in "Boss Battles" in the section with HRC, and target test would be the easiest place to start. Then, once you figure that out, you could find a way to use it in SSE.
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