I might actually say screw Ardent Sacrifice on Elincia and replace it with Reposition, only being limited to two moves makes a flier team hard to manage and they're all super squishy.
Also, Elincia needs Desperation, at least with L&D3 if you want her to carry your team. She's too squishy. The counter hits after your brave hits will leave you at low HP/vulnerable, at least if you want her to be functional in Tempest Trials and stuff. Plus QUADing stuff is a blast.
Might build QUAD emblem, easily defeated by B. Ike, with Brave Lyn, Brave Lucina, Delthea, and Elincia. They can just murder everything in style. Less fun alternative involves Xander and Hinoka for their respective +6/+6 buffs, not easily beatable by B. Ike.