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- Seen Oct 9, 2017
From what I know only the OTID has the right to change a Pokémon's nickname.
As Volga says, if it came from a different save/different game(transfered through PokéBank from older Generations, his other Gen VI games) then he wouldn't be able to change it.
Check your friend's Trainer Card and your Pokémon's OTID and ID if they are exactly the same.
the problem with that is it doesn't matter if the OT and ID number are the same, the SECRET ID number ALSO needs to be the same and there's no in game way of checking that. As Volga pointed out, there is a Power Save code that makes pokemon shiny, but it changes their Secret ID number, so if your friend has the exact same OT and ID number in his game as the pokemon he traded you has, it's pretty obvious that it's most likely he's been power saving and just doesn't want to admit to it! ;-)