This event will follow a separate rule for 3v3 battle.
Source: https://www.gundam-gcg.com/en/news/battle-royale.html
Here are decks of 3 champion's teams of 3 blocks of the event (The host didn't mention about number of teams or matchups result of each players.
Undefeated Team: Fury Game: Red/White SEED Justice, Blue/White Ariel-Freedom, and Blue Purple Barbatos Aggro.
Team Arsenal Base: Blue/Purple Barbatos Aggro, Blue/Green Aggro, and Green/White Wing-zero
Team Fallow Shuffle Alliance: Red/Green Qubeley, Red/White Qubeley, and Green/White WingZero -Justice.