Physical Cutiefly OHKO strat - 7-star Charizard

=====TEAM=====
Cutiefly @ Focus Sash
Ability: Shield Dust
EVs: 252 Atk / 252 Spe
Adamant Nature
- Play Rough
- Psych Up

Magmar @ Eviolite
EVs: 252 HP / 252 SpD
Calm Nature
- Belly Drum

Swampert @ Zoom Lens
EVs: 252 HP / 252 SpD
Calm Nature
- Screech

Florges (F) @ Choice Band
Ability: Symbiosis
EVs: 252 HP / 252 SpD
Calm Nature
- Helping Hand

=====STRAT=====
If Overheat hits Cutiefly turn 0, we lose

Turn 1:
Swampert: Screech on Charizard
Florges: Attack cheer
Magmar: Belly Drum
Cutiefly: Psych Up on Magmar (must wait until after Belly Drum)

Turn 2:
Swampert: Screech on Charizard
Florges: Helping Hand on Cutiefly
Magmar: does nothing
Cutiefly: wait for everything to go off then Play Rough

IF Charizard misses Cutiefly turn 1, just spam Heal Cheer until it hits Cutiefly

=====CALCS=====
+6 252+ Atk Choice Band Cutiefly Helping Hand Atk Cheer Play Rough vs. -4 0 HP / 0 Def Tera Dragon Charizard: 8420-9908 (113.4 - 133.4% of 25x hp boss) -- guaranteed OHKO