For both Dragon Duels and the normal tournament
Q: Are there any special rules I need to know for the WCQ – Nationals and Dragon Duel Nationals? * UPDATE 5/30/14 *
A: In the final Match of the Playoff Top Cut of the WCQ – Nationals and Dragon Duel Nationals, Duelists may not concede a game or Match. Duelists must play out the Match, in order to ensure a clear National Champion. If a Duelist does concede a Match in the Finals of the Playoff Top Cut of the WCQ Nationals or Dragon Duel Nationals, they will be dropped from the tournament and will no longer be eligible to receive any prizes to which they may have been entitled.
Source:
Konami