Board Thread:Questions and Answers/@comment-141.117.118.228-20150604161612/@comment-26021614-20150604223552

Guardian Cloak. That's how I beat a lot of my first Mecha God trials before I got my 7* team. Any unit with high defense and high HP. Two is always better. And then a leader skill with mitigation, HP increase, and/or defense increase. Kanon friend, Tridon leader works really well, although if your units do not have at least 12,000 HP after the two boosts I wouldn't recommend using Tridon's BB/SBB because the elemental shield has lower defense and if the opponent uses an attack that surpasses the shield, your defense remains the same as the shield until after that attack, but that could easily knock off another 3000-4000 HP off your unit rendering your Guardian Cloak useless.

Seeing as how you don't have Kanon or Tridon, an alternative unit to use would be Narza and Oulu (6* form of Ice Tower Tesla). The added mitigation and defense increase should be suffice for Guardian Cloak to work even with a bit lower HP. That said, you may or may not need to increase your summoner level and cost before you are able to build such a team. Anything less than a full 6* team is not advisable for Mecha God trials.