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I was just wondering if this was possible
Yes. It is possible, with this tool I made called The Soul Sucker 9001. What you do is you open a new file in a hex editor, enter certain spiritual characteristics (like a happy spirit, a vengeful spirit, the kind of spirit that will steal your face if you show any emotion whatsoever, etc.), and save. Then you use my tool to convert the spirit into a Pokemon compatible spirit file, and enter it at the right hex offset. I think there's a list of hex offsets somewhere around here...
You can try to hide yourself in this world of pretend; when the paper's crumpled up, it can't be perfect again.