What is the hardest fight in Persona 5 Royal?

Hey there, fellow gamer! I'm curious to know, what do you consider to be the toughest battle in Persona 5 Royal? Is it taking on the mysterious villain in the final showdown, or perhaps a particularly challenging dungeon crawl? Share your thoughts on what battle left you scratching your head and sweating bullets, eager to hear your take on the most grueling fight in this critically acclaimed RPG!