>>19684850Depends on what is its role,
Trick Room, SD, all out attacker, Sub BU/SD, Assault Vest, support, choiced?
In all these cases I'd go with Justifies because with Knock Off, Sucker Punch and some other rare moves it's easier to get an Attack boost compared to a Speed one due to flinching.
In Gen6 I do like the AV Gallade with max HP and Attack, Knock Off / Close Combat / Psycho Cut / and filler between Shadow Sneak / Leaf Blade / Stone Edge / Poison Jab / Power up Punch, this are probably the most common and useful fillers for the AV set.
Unless SD or TR I don't see any use on improving or modifying its speed, 80 base stat is pretty annoying as number to fit it as TR or offensive Pokemon since it has almost no natural bulk.
