How to get magnetism after un-magnetized 360A, from easy to hard:
22D: Tager, Bang
5B->4D: Ragna
Walk a few frames, 5B->4D: Litchi, Lambda, Jin, Bang (but use 22D instead)
262D: Noel (easy), Haku (HARD!), Ragna (but use 5B->4D instead)
Walk the most you can, 5B xx Spark: Carl
Not possible, use 3C: Hazama, Tsubaki, Arakune, Taokaka
On anyone you can 5B, you can do 5B xx Spark, 2C xx AC, 5D for 3796 and lots of magnetism.