If you don't have anything to super evolve any vivosaurs, I use Raja as a wall for the team to pound on and use Sungari's rotating and Tricera's pure attack from medium range. In a while Zongazonga will suspend one of his Z-Rexes with Law Of The Jungle, and heal just about nothing. After that, defeat Zongazonga and beat both Z-Rexes in 2 rounds or less, on my first time, I used team skills to do this. Yes, Raja, Tricera and Sungari have team skills.