IVs Summer Linde and Summer Camilla...

For Linde her best option is to go a debuffing set to help her allies. Smoke Dagger, speed refined to help her escape doubles, and a Hone/Fortify Cavalry with an appropriately helpful seal. Wind or Watersweep can allow her to debuff without fear or she could use Wings of Mercy to get around better.

Camilla, Blarblade. Add Death Blow, Swift Sparrow or Fury with Desperation, give her full flying buffs and your good to destroy. If you already have Summer Corrin running this then with +Def Camilla could go with Iote's Shield and Blarraven/TA set.