WTH, I got totally smoked trying this without referring to the guide. Wasn't aware they can attack 3 times when they didn't complete the kill in the first hit like we need to.
If you are talking about expert 1
my experience for clearing. i use Zeta as main attacker (2 defener ,2 support (must able to tahan twice attack, pilot with defense skill) ,1 attacker)
the AOE attack is very painful..
there is a guide ,formation very important for team 1. there is a placement that the AI will not do the AOE attack in the first round for team 1.
for the bottom part just reduce the hp as much as u can for the first turn.. let them all die but left 1 unit to lure it (move toward the right, but also have to make sure not too far away) ,so it wouldn't move upward to ur team 1 for you to concentrate on that 2 top enemy first