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However if you got it in a trade from these forums (or from someone you know) then you can ask politely to trade back so they can rename it for you... just remember people are nice if you are nice to them first
yea... the pokemon's got to have the same ID NO and trainer name as the person trying to nickname it. You can trade it back to have it nicknamed, I have successfully tried that... but it's a bummer trying to nickname shinies traded around here.