Basically I'm trying to farm Max Mushrooms and I was wondering how often they spawn. The student who makes the max soup says that if you play max raid battles, max mushrooms will grow in forests in caves on the Isle of Armor (e.g. forest of focus, brawler's cave, etc.). What I want to know is, how exactly does this work? Is there a mathematical formula that determines whether max mushrooms spawn after x amount of max raid battles? What are all the factors involved?