228 Def / 28 SpA / 252 Spe
Naive Nature
228 defense evs allow azelf to survive fake out + return from mega lopunny 100% of the time barring crits. 28 spa evs gives a 50% chance to ohko naive mega diancie with hp steel and the speed investment outspeeds everything up to raikou and starmie.
Choice Band Hoopa-U
252 Atk / 4 Def / 252 Spe
Jolly nature
max attack to wallbreak effectively and 252 speed allows hoopa-u to speed tie with gardevoir prior to mega evolving, mega altaria, and also outspeeds threats such as mega heracross and bisharp.
Choice Scarf Hoopa-U
252 Atk / 4 SpA / 252 Spe
Hasty Nature
maximum speed investment with a choice scarf allows hoopa-u to outspeed the likes of mega lopunny and mega manectric while a hasty nature prevents psychic from being weakened.
Choice Specs Hoopa-U
4 Def / 252 SpA / 252 Spe
Timid Nature
maximum special attack allows hoopa to wallbreak effectively and is capable of even 2hkoing chansey with psyshock. max speed ties with opposing hoopa-u, garde pre-mega, and mega altaria.