Turn 1:
0 Atk Zeraora Gigavolt Havoc (180 BP) vs. 252 HP / 252+ Def Blissey: 387-456 (54.2 - 63.8%) -- guaranteed 2HKO
Blissey uses Z-Charm

Turn 2 
Taunt
Blissey Tosses: Blissey Seismic Toss vs. 92 HP Zeraora: 100-100 (29.4 - 29.4%) -- guaranteed 4HKO
, or whiffs due to taunt

Turn 3
0 Atk Zeraora Plasma Fists vs. +1 252 HP / 252+ Def Blissey: 144-171 (20.1 - 23.9%) -- guaranteed 5HKO
Blissey Seismic Toss vs. 92 HP Zeraora: 100-100 (29.4 - 29.4%) -- guaranteed 4HKO

Turn 4
0 Atk Zeraora Plasma Fists vs. +1 252 HP / 252+ Def Blissey: 144-171 (20.1 - 23.9%) -- guaranteed 5HKO
Blissey Seismic Toss vs. 92 HP Zeraora: 100-100 (29.4 - 29.4%) -- guaranteed 4HKO
Taunt ends

Turn 5, Kos with Plasma Fists