1st Battle- Low LP, high stats. Knock out someone in the SZ, and ZZ's strategy may change, as one time he used Team Skills, and the second, he used lower FP moves.
2nd battle- I would prefer knocking out ZZ first. If you're lucky, he may use Law of the Jungle when he's low on LP, but A Z-Rex's LP is only about half of his LP. Then the Z-Rex is only left with one LP, but save it for later. Knock out ZZ with a Super Evolver (use Lugmos or Giga Raja, because you can use Charge.) Weaken the more plentiful Z-Rex, and then knock out the second. All my teammates were knocked out on the second fight, but then again, they were Small/Medium sized vivosaurs. ZZ and Z-Rex are large. I have decided that I will use Krypto, not Goyle.