The only reason I can believe that is because a friend of mine, who usually knows better, was in an insane panic when he lost to the version with four
Guzzlord-GX and 56
Darkness Energy. The short version is he goofed, and would allow
Guzzlord-GX to get the Gluttony-GX KO, plus he was playing rogue decks with low HP attackers. XP While I can see how those decks would lose, I saw first hand how built competently, played competently, and not having bad luck means they win.
Edit: Sorry, was focusing on the decks I recognized; realized that's only
Gardevoir-GX and
Golisopod-GX. That's totally my bad. >.>