AOE specials, passive, and weapon can be helpful in this challenge.
If using a mixed team, a unit with distant counter skill or weapon to take out the Green Cavalier early is helpful.
Movement assists such as Reposition and Swap can work wonders in this challenge, especially for a non-flier or mixed team.
Unit Recommendations[ | ]
A flier emblem team, especially one with either Camilla: Spring Princess or Corrin: Novice Vacationer, can complete the challenge with ease. However, it can still be difficult if you are missing one of the three colors on your flier team. Nevertheless, even without a complete flier team, a pair of blue and green fliers -- one player phase focused and the other enemy phase focused -- such as Brave LanceEst: Junior Whitewing and MoonbowMinerva: Red Dragoon with Quick Riposte can handle the enemy fliers swiftly. It is preferable that the blue flier can tank a hit from Red Mage. Thus, either sufficient Spd or Res is required. For low Res blue flier such as Cordelia: Knight Paragon, be sure to use Spd +3 skill and seal in conjunction with one of +Spd IV, Ally Support or Summoner Support to avoid being doubled by the LnD Red Mage.
A physically bulky unit with distant counter such as Ike: Young Mercenary with Quick Riposte can be helpful for taking out the Green Cavalier early. Ryoma: Peerless Samurai without sufficient merges can have a difficult time later due to lack of physical bulk. Alternatively, Celica: Caring Princess can also ORKO Green Cavalier with the speed boost from Ragnarok, (although she may have to break the wall in an earlier turn in order to avoid Spd Ploy from Green Cavalier;) she can't tank any physical hits but her range attack and AOE special can help countering the armor onslaught.
Dragons typically have high defense while having magical attacks that target resistance, making them an ideal counter to armored units, who typically have low resistance.