There is no “South Pole” in the flat model.
Magnetic monopoles don't exist. See Gauss' Law for the reason. If they did exist, we could have stable magnetic levitation and Back to the Future hoverboards would be real.
There is no singular “South Pole” in the flat earth model. There is also no dipole spherical magnet in nature or even manufactured. There is no reason to believe you live on one.
I tend to avoid these “gotcha” question threads because they’re dishonest. You have to have a critical thinking mindset to ever understand flat earth. Meaning that when you ask “why does the core shift polarity” or whatever, any actual flat earther immediately realizes that you don’t have any way of knowing that the earth has a molten iron core. It is literally impossible for you to know that. So you’re asking questions from basically a false premise.
You could just say you don't have an answer instead of making claims that "no single south pole exists" or that spherical magnets can't be dipolar. You don't have any way of knowing if the Earth has multiple south poles and you definitely can't answer my question of how the poles can shift/reverse on the flat model. You are positing that your claims are correct when they are from the false premise of "you have to have a critical thinking mindset to ever understand flat earth".
Thought experiment, oh critical thinker. Take a rectangular bar magnet 2 inches long by 1 inch wide by 1 inch thick. The bar has it's north and south poles at the opposite ends of the 2 inch length. Carefully file that bar down until it forms a cube 1 x 1 x 1 inch. Now carefully file that cube's corners until you have a sphere. Where are the poles located now?
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