How did my +5 SpD Unaware Clefable die to a Xerneas with +2 SpA?

Question

Clefable
EVs: 4 SpD
+5 SpD from Calm Mind
Unaware
Roughly 77%-84%

Xerneas
EVs: 252 SpA
Modest / Timid
+2 SpA cancelled due to Unaware
Fairy Aura
It did crit but I calculated it so it supposed to do around 50%.

Comments

+2 252+ SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 4 SpD Unaware Clefable on a critical hit: 372-438 (94.4 - 111.1%) -- 62.5% chance to OHKO

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Critical hits ignore defence boosts

Answer 1

Modest:
+2 252+ SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 4 SpD Unaware Clefable on a critical hit: 372-438 (94.4 - 111.1%) -- 62.5% chance to OHKO

Timid:
+2 252 SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 4 SpD Unaware Clefable on a critical hit: 339-400 (86 - 101.5%) -- 12.5% chance to OHKO

No Sp. Atk raises:

Modest:
252+ SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 4 SpD Clefable on a critical hit: 372-438 (94.4 - 111.1%) -- 62.5% chance to OHKO

Timid:
252 SpA Fairy Aura Xerneas Moonblast vs. 252 HP / 4 SpD Clefable on a critical hit: 339-400 (86 - 101.5%) -- 12.5% chance to OHKO

No critical hit:

Modest:
252+ SpA Fairy Aura Xerneas Moonblast vs. +5 252 HP / 4 SpD Clefable: 72-85 (18.2 - 21.5%) -- possible 5HKO

Timid:
252 SpA Fairy Aura Xerneas Moonblast vs. +5 252 HP / 4 SpD Clefable: 66-78 (16.7 - 19.7%) -- guaranteed 6HKO

Comments

I’d like to add that it’s because critical hits ignore opposing defense boosts.