So I have a mew from the recent code event and the nature is quirky which isn't the best nature. However according to the stat judge says its HP, ATK, Sp. DEF, and Speed are all 31 IV. So I used the IV calculator on serebii and according to it my Mew is 31/31/12/14/31/31. I like it but at the same time I want a special attacker Mew and it has a rather low special attack. So I guess in your opinions should I keep this Mew or keep resetting?
Don't keep it. I soft reset for my own mew too. it's easier now, every mew you soft reset will be sure to have 3 IVs, just have the calculator with you it'll be very helpful.