User blog comment:Franpsbarb4/Help with Maxwell and 7* dungeons/@comment-26140304-20150412145814

Try using this squad setup:

Tridon (Lead), Rosetta, Rigness, Kira, Oulu, Lilly Matah (Friend)

Tridon provides the shield to help the squad tank a bunch of hit. Plus, his Leader Skill will beef up your units' survivability.

Rosetta provides one of the highest Spark buffs in the game.

Rigness is your Anti-Debuff unit. I highly recommend equipping him with Drevas or Refined Gem.

Kira helps with dealing massive amounts of damage. Plus, his Critical Rate buff is the highest in the game.

Oulu is your mitigator. He is the evolution of Tesla. I recommend giving him Dandelga & Evil Shard so you can get his BB a lot easier as you will need to use his BB every turn.

Lilly Matah is one of the crucial candidates of the squad as she increases your units' BB gauges when they get attacked.

Also, make sure you count your turns starting Turn 1 of Juggernaut. Maxwell has an attack pattern that you need to know. Use this turn counter to assist you in Trial 003.

Hope this helps! Good luck! :D