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I wasn't even trying to MM, just breeding a female with sturdy to breed her Mirror Coat (males can give their HA while breeding with a Ditto, mine is a Japanese I got from wonder-trading) while in my 4th egg I got this.
I'm not sure if I could try again after I beat the league to get one with more IVs (this at least got def and maybe HP) and a better nature or just being grateful with my first shiny without even trying...