>>29747092No it wouldn't, there are different (array of) bytes for the species and nicknames, and the game checks only for species.
>>29747145Yep, like with Hoopa's moves, it will say "Smeargle can't use this move!" and waste a turn.
... can't wait to see a bunch of kids trying to use Dark Void with it without knowing the secret. It'll be fun watching that stupid painter dog wasting a turn on nothing.