I used the legendary warriors pre-built deck, and as long as you pull a Marmiting captain in your opening hand (or second turn) and his ability special summons a monster its a guaranteed quick victory.
I used the joey wheeler structure deck when fighting them and i needed to get x saber parahu sword of dragon soul assult armor and x saber galahad equip the sword of dragon soul and assult arrmor to priahu and on the second one of your turns use galahad to destroy the monster on the brothers field then activate the assult armor for game
Skill: Power of the dark
Turn 1 (PB)
PB sets normal monster
Turn 2 (Player)
Summon 🔥 Archfiend, equip +500 or more
Set Security Orb or Dimensional Prison
Attack with 🔥 Archfiend.
PB loses 1100-1500
Turn 3 (PB)
PB Summons normal monster
Attacks with normal monster
Activate trap
Turn 4 (Player)
Summon 1800 ATK
Attack with 🔥 Archfiend first (PB loses 1100-1500)
Then attack with 1800 ATK
PB LP 0
I tried so many decks before I managed to do this.
The easiest way I found was using Pegasus and his toon decks. Any 4* toon mon will do with 2k or more atk. Use his toon world skil, Summon any 4* toon Mon with 2k+ at and add a couple of toon rollback cards to the deck. You can summon turn 1 and attack twice their LP directly on turn 3.
It only took me 3 attempts to get both quick victories.