I don't think anyone's considered the thought of Physical Scarf Aegislash, which sounds gimmicky but works stupidly well as a check to so many things.
Aegislash@Choice Scarf
Ability: Stance Change
EVs: 252 Attack/252 Speed/4 HP
Nature: Jolly
-Iron Head
-Sacred Sword
-Shadow Claw
-Rock Slide
Now, before we start with the sighs of the gimmick nature here, this set is designed as a revenge killer or check. With max speed and Jolly, Scarfed Aegislash hits 360 speed, which is enough to outrun max speed pokemon with 114 base speed by 1 point, as well as speed neutral pokemon under 130 speed. Notably, this includes Mega Lucario, Talonflame, Gengar and Galvantula, among others. The basis of this set comes in the knowledge that Aegislash always switches in under its bulky Shield Forme. It then proceeds to outrun and KO threats as needed. With hazard support, even a single layer of Spikes, this set outpaces max speed Mega Lucario (355) and with the above EVs, does spectacularly against Mega Luke.
252 Atk Aegislash-Blade Sacred Sword vs. 0 HP / 4 Def Mega Lucario: 242-286 (86.1 - 101.7%) -- 12.5% chance to OHKO
With a layer of Spikes up, that becomes an 87.5% chance to OHKO. Ideally, when you see Mega Lucario you want to switch in on the expected SD/NP, and then smash it swiftly afterwards. Because Aegislash will be in shield forme, it can withstand an unboosted hit from MegaLuke.
252 SpA Mega Lucario Dark Pulse vs. 4 HP / 0 SpD Aegislash-Shield: 130-154 (49.6 - 58.7%) -- 99.6% chance to 2HKO
252 Atk Mega Lucario Crunch vs. 4 HP / 0 Def Aegislash-Shield: 134-158 (51.1 - 60.3%) -- guaranteed 2HKO
This also beats Adamant Talonflame with Rock Slide and any Gengar with Shadow Claw, while providing a role as a spectacular check considering Aegislash's meaty 399 attack.
Aegislash@Choice Scarf
Ability: Stance Change
EVs: 252 Attack/252 Speed/4 HP
Nature: Jolly
-Iron Head
-Sacred Sword
-Shadow Claw
-Rock Slide
Now, before we start with the sighs of the gimmick nature here, this set is designed as a revenge killer or check. With max speed and Jolly, Scarfed Aegislash hits 360 speed, which is enough to outrun max speed pokemon with 114 base speed by 1 point, as well as speed neutral pokemon under 130 speed. Notably, this includes Mega Lucario, Talonflame, Gengar and Galvantula, among others. The basis of this set comes in the knowledge that Aegislash always switches in under its bulky Shield Forme. It then proceeds to outrun and KO threats as needed. With hazard support, even a single layer of Spikes, this set outpaces max speed Mega Lucario (355) and with the above EVs, does spectacularly against Mega Luke.
252 Atk Aegislash-Blade Sacred Sword vs. 0 HP / 4 Def Mega Lucario: 242-286 (86.1 - 101.7%) -- 12.5% chance to OHKO
With a layer of Spikes up, that becomes an 87.5% chance to OHKO. Ideally, when you see Mega Lucario you want to switch in on the expected SD/NP, and then smash it swiftly afterwards. Because Aegislash will be in shield forme, it can withstand an unboosted hit from MegaLuke.
252 SpA Mega Lucario Dark Pulse vs. 4 HP / 0 SpD Aegislash-Shield: 130-154 (49.6 - 58.7%) -- 99.6% chance to 2HKO
252 Atk Mega Lucario Crunch vs. 4 HP / 0 Def Aegislash-Shield: 134-158 (51.1 - 60.3%) -- guaranteed 2HKO
This also beats Adamant Talonflame with Rock Slide and any Gengar with Shadow Claw, while providing a role as a spectacular check considering Aegislash's meaty 399 attack.