Did you make use of any ingame glitch to capture non released mythical or menu glitch to evolve into shiny Pokemon? I heard they have started to ban players who did that to prevent spread of hacked Pokemon.
Which is why your cfw save can still do local trades but your ofw legit game might be banned from online trade.
Which is why your cfw save can still do local trades but your ofw legit game might be banned from online trade.