Walkthrough: After using the final Spark Pylon, Madame Broode will make a surprise appearance and challenge you to another battle. She hasn't been seen since you first defeated her back in Cascade Kingdom, but now she is the last foe standing between you and the wedding. She is back with her Golden Chain Chomp, the same that has not one but three hats. Luckily, the fight will go more or less the same as before, starting with the Chain Chomp dashing at Mario.
You can easily dodge its attacks, allowing you a chance to hit off one of its hats. Keeping dodging and hitting off one hat at a time, and once it's hat-less, capture it using Cappy and run away from Madame Broode. She'll begin swiping at you, but as long as you keep moving, she'll quickly get exhausted and leave herself open for you to attack her. She'll retaliate after you do by tossing her Chain Chomp quickly and spinning, so keep running and jumping in order to avoid it. Once it end, repeat the steps in second phase of the match. Each time you hit her in the face, the Chain Chomp will get more and more hats, making the process all the longer (but still as easy).
After landing three hits of Madame Broode with her own pet, Madame Broode will be finished off for good. You won't receive a Power Moon for defeating her, but rather the path to Bowser. If you need some health, douse the torch on your right before the exit. From there, all that's left to do is make your way across Ever After Hill and into the chapel to stop the forced wedding.