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I am wildly conflicted about what to do with this.
For one, I've got a mostly powered up 98% one that I'm halfway to ultra buddy, since I never anticipated getting anything better.
Second, if I choose to use it I could leave it shadow, but it'll be a monstrous cost to power it up to a viable level.
Holding off on purifying until I have a better grasp on the pros and cons of shadow mons.