Haven't posted in a while, so I'll participate.
Latios | Life Orb | Levitate
Timid | 252 SpA / 4 SpD / 252 Spe
Dragon Pulse | Psyshock | Hidden Power [Fire] | Calm Mind
Calm Mind Latios is easily one of the most unprepared things in the metagame. You just remove Aegislash and the things that can revenge kill / cripple it like Bisharp, Thundurus-I, and Mega Mawile and this thing can set up and sweep. It doesn't suffer from speed issues because it has 110 Base Spe and the things that can revenge kill it can't RK it because of +1 SpD (i.e. Greninja and Deoxys-S). Dragon Pulse is your main STAB. It hits very hard and has a great coverage. Psyshock breaks past Mega Venusaur, AV Azumarill (w/ little p. damage), and Chansey + is great alternative STAB when Dragon Pulse is too risky. Hidden Power [Fire] completes the coverage against Ferrothorn, Excadrill, and severely damages Bisharp and Mega Mawile on the switch. This set lures in Bisharp because they think you will Defog where Hidden Power [Fire] comes in to nail it. You can use a bulkier spread, but Aegislash's Shadow Sneak doesn't OHKO it iirc without Spooky Plate, so a weakened Aegislash loses to +1 LO HP Fire. It's a nice wall-breaker and only few things need to be weakened for it to wreck havoc / sweep.
Latios | Life Orb | Levitate
Timid | 252 SpA / 4 SpD / 252 Spe
Dragon Pulse | Psyshock | Hidden Power [Fire] | Calm Mind
Calm Mind Latios is easily one of the most unprepared things in the metagame. You just remove Aegislash and the things that can revenge kill / cripple it like Bisharp, Thundurus-I, and Mega Mawile and this thing can set up and sweep. It doesn't suffer from speed issues because it has 110 Base Spe and the things that can revenge kill it can't RK it because of +1 SpD (i.e. Greninja and Deoxys-S). Dragon Pulse is your main STAB. It hits very hard and has a great coverage. Psyshock breaks past Mega Venusaur, AV Azumarill (w/ little p. damage), and Chansey + is great alternative STAB when Dragon Pulse is too risky. Hidden Power [Fire] completes the coverage against Ferrothorn, Excadrill, and severely damages Bisharp and Mega Mawile on the switch. This set lures in Bisharp because they think you will Defog where Hidden Power [Fire] comes in to nail it. You can use a bulkier spread, but Aegislash's Shadow Sneak doesn't OHKO it iirc without Spooky Plate, so a weakened Aegislash loses to +1 LO HP Fire. It's a nice wall-breaker and only few things need to be weakened for it to wreck havoc / sweep.