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Umm I completely forgot, looking into it here are some calcs I found regarding the spread that you can keep in mind. Thinking back on it I think it's just some spread a friend gave me.

+1 252 Atk Parental Bond Mega Kangaskhan Double-Edge vs. 252 HP / 52 Def Cresselia: 184-218 (81 - 96%) -- guaranteed 2HKO (+1 after Kang uses PuP and Mence gets Inimidate off)

252 SpA Primal Groudon Eruption (150 BP) vs. 252 HP / 204+ SpD Cresselia in Harsh Sun: 100-118 (44 - 51.9%) -- 13.3% chance to 2HKO

252 Atk Life Orb Dark Aura Yveltal Sucker Punch vs. 252 HP / 52 Def Cresselia: 198-234 (87.2 - 103%) -- 12.5% chance to OHKO

+2 252+ SpA Fairy Aura Xerneas Dazzling Gleam vs. 252 HP / 204+ SpD Cresselia: 94-112 (41.4 - 49.3%) -- guaranteed 3HKO

The last one looks the most specific, so that may have been where it came from. Just keep in mind that almost nothing is going to OHKO the Cresselia