Spawn Time: 30 Minutes
This boss will give about 2 million EXP after being defeated, so server hopping for Cake Queen is a good way to farm mastery. Her health and damage output may be a put-off, though, so get a powerful devil fruit, sword and/or some other people to help you if possible.
Tips and Tricks
Do NOT walk straight when fighting, as Lightning Wave [X], does lots of damage. Walk AROUND the Boss and attack instead of directly engaging.