Quoted By:
What does /vgc/ think of this hydreigon spread?
48 HP/108 Def/252 SpAtk/48 SpDef/52 Spd
From those stats (they were calculated off of my 5/31/31/31/31/31 shiny deino so adjusted slightly)we get
160 HP,multiple of 16
125 speed (boosted to 187.5 by scarf), enough to outspeed Tyraniscarf with my own scarf, as well as every 252+Spd Jolly pokemon with 116 or less base speed (max speed hawlucha has 187 speed as well so we'll just assume a tie)
These stats give the following calcs:
252 Atk Garchomp Dragon Claw vs. 48 HP / 108 Def Hydreigon: 134-158 (83.7 - 98.7%) -- guaranteed 2HKO
252+ SpA Hydreigon Draco Meteor vs. 0 HP / 0 SpD Garchomp: 270-320 (147.5 - 174.8%) -- guaranteed OHKO
252 Atk Weavile Ice Punch vs. 48 HP / 108 Def Hydreigon: 116-140 (72.5 - 87.5%) -- guaranteed 2HKO
252+ SpA Hydreigon Fire Blast vs. 4 HP / 0 SpD Weavile: 154-182 (105.4 - 124.6%) -- guaranteed OHKO
252 Atk Parental Bond Mega Kangaskhan Return vs. 48 HP / 108 Def Hydreigon: 126-148 (78.7 - 92.5%) -- guaranteed 2HKO
252 SpA Mega Manectric Hidden Power Ice vs. 48 HP / 48 SpD Hydreigon: 74-88 (46.2 - 55%) -- 62.5% chance to 2HKO
252+ SpA Mega Charizard Y Dragon Pulse vs. 48 HP / 48 SpD Hydreigon: 128-152 (80 - 95%) -- guaranteed 2HKO
252 Atk Dragonite Dragon Claw vs. 48 HP / 108 Def Hydreigon: 134-162 (83.7 - 101.2%) -- 6.3% chance to OHKO
252 SpA Protean Greninja Ice Beam vs. 48 HP / 48 SpD Hydreigon: 134-162 (83.7 - 101.2%) -- 6.3% chance to OHKO
252+ Atk Mamoswine Ice Shard vs. 48 HP / 108 Def Hydreigon: 74-90 (46.2 - 56.2%) -- 69.9% chance to 2HKO
252+ SpA Hydreigon Draco Meteor vs. 0 HP / 0 SpD Mamoswine: 178-210 (96.2 - 113.5%) -- 75% chance to OHKO
This assumes Mamo has Thick Fat, otherwise Fire Blast or even Flamethrower would clean it out
252 SpA Gengar Dazzling Gleam vs. 48 HP / 48 SpD Hydreigon: 144-172 (90 - 107.5%) -- 43.8% chance to OHKO
252+ SpA Hydreigon Dark Pulse vs. 0 HP / 0 SpD Gengar: 186-218 (137.7 - 161.4%) -- guaranteed OHKO
Out of space you get the jist of it