If the 12th Planet causes a pole shift in the Earth as it passes, being the larger body between the two, how is it that the 12th Planet itself does not experience a pole shift as it passes the Sun, which is a larger body than the 12th Planet.
Magnetic fields clash with one another when a certain closeness creates a particle press.
What happens during a passage is that the flows clash, and the density of particles pushes the magnetic bodies about. Think of the North pole as a water hose, a force of water coming from it capable of pushing solid objects aside. When this force cannot go up and through the center of another magnetic object in front of it, it must have someplace to go. Two magnets prevented from snapping together when one passes the other, coming from the south, will have a particle flow force coming from the North pole of the passing object - a South to North flow. This particle flow meets the peripheral or returning particle flow of the stationary object - a North to South flow.