https://www.youtube.com/watch?v=iQ0ydtNqEXA
This fight took a loong time to do, it is extremely difficult. But with this video I discussed my specific strategy in detail, so hopefully this will help the people that have been trying to beat this boss for a while in the forums. To summarize my strategy really quickly, I make it so that Rosalina NEVER gets a turn by herself, meaning the only thing she can do is that holy attack and her Galaxy Beam attack. Since Rosalina can't do any other attack with the lumas present, and Morning Star only does Damage to 3 lumas, that sets me up perfectly for this strategy. Everything else is explained in the video. Doing this in hard mode is gonna be an absolute nightmare, but im ready for the challenge I guess....