>>21417163In VGC you gotta go fast and hit hard.
If you change its speed other mences will shit on you, if you lower its special attack Mawile will survive more easily and sucker punch your shit.
A -1 Mega Mawile will still hurt it a lot and leave it in KO range for whatever you have together with it.
A 252 spA 252 spe is better at the end, it will die more easily but will cripple Mawile for whatever comes after mence.