Set
Max Speed + Max attack with a jolly nature gives Emboar with 130 inherited speed a 394 speed stat, the same as Tapu Koko. Head Smash, Flare Blitz and Wild Charge for a Reckless power boost. Heavy Slam for Diancie Mega. Possibility to choose between earthquake and wild charge. EQ for doing 75% damage to P-Don and reliably OHKO'ing marowak alola without having to worry about missing head smash. Wild Charge is for Kyogre primal and OHKO'ing sweeper Ho-oh sets without, again, having to worry about head smash missing. Manbearpig has a lot of threats that it can almost finish off with one hit so stealth rocks support is very useful in this case (see calcs). Superpower for stab.
Calcs(basic):
252 Atk Choice Band Reckless Emboar Flare Blitz vs. 252 HP / 0 Def Magearna: 602-710 (119.4 - 140.8%) -- guaranteed OHKO (inherited 150 HP)
252 Atk Choice Band Reckless Emboar Head Smash vs. 252 HP / 4 Def Shuckle: 270-318 (53.5 - 63%) -- guaranteed 2HKO
252 Atk Choice Band Emboar Heavy Slam (120 BP) vs. 0 HP / 0 Def Diancie-Mega: 696-820 (157.8 - 185.9%) -- guaranteed OHKO (inherited 150 HP)
252 Atk Choice Band Reckless Emboar Wild Charge vs. 40 HP / 252+ Def Alomomola: 282-334 (58.6 - 69.4%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Choice Band Reckless Emboar Flare Blitz vs. 252 HP / 144+ Def Buzzwole: 416-492 (99.5 - 117.7%) -- 93.8% chance to OHKO after Leftovers recovery
252 Atk Choice Band Emboar Earthquake vs. 0 HP / 0 Def Groudon-Primal: 208-246 (60.9 - 72.1%) -- guaranteed 2HKO
252 Atk Choice Band Reckless Emboar Flare Blitz vs. 252 HP / 252+ Def Clefable: 216-255 (54.8 - 64.7%) -- guaranteed 2HKO after Leftovers recovery (Inherited 120 Def)
252 Atk Choice Band Reckless Emboar Flare Blitz vs. 0 HP / 4 Def Alakazam-Mega: 288-340 (114.7 - 135.4%) -- guaranteed OHKO (inherited 120 def)
Calcs(where Stealth Rocks support matters):
252 Atk Choice Band Reckless Emboar Flare Blitz vs. 248 HP / 252+ Def Skarmory: 386-456 (87.1 - 102.9%) -- 93.8% chance to OHKO after Stealth Rock (Inherited 120 HP)
252 Atk Choice Band Reckless Emboar Wild Charge vs. 32 HP / 124 Def Kyogre-Primal: 324-382 (92.8 - 109.4%) -- guaranteed OHKO after Stealth Rock
252 Atk Choice Band Reckless Emboar Head Smash vs. 252 HP / 252+ Def Zapdos: 452-532 (89.6 - 105.5%) -- guaranteed OHKO after Stealth Rock and Leftovers recovery (Inherited 150 HP)
-1 252 Atk Choice Band Emboar Superpower vs. 0 HP / 0 Def Gyarados-Mega: 350-414 (79.3 - 93.8%) -- 43.8% chance to OHKO after Stealth Rock (Inherited 150 HP)
