Thank you both. Thank goodness I already have a Japanese Diancie, so much text if I didn't **;
Also I checked my Japanese Diancie, it has 3IVs... perhaps it is the server, IDK.
There's so many speculations.. some people blamed the update but others still had 'bad' ones after the update. Some people blame the codes themselves but mine was the "bad" code starting with AZA4 and mine was fine.
Servers would be a weird one though, if some people are getting one good Diancie and one bad Diancie from the same location.. you'd assume they'd be using the same server both times? Odd.
You specify Japanese like it was traded to you. How'd you come by it, if you don't mind my asking? o: