Fire Emblem 6 - Gonzales vs Idoun (1RKO)
First of all, thanks to Vykan12 for give me the idea of using a Berserker for this operation.
You need the following:
A Berserker with maxed Strenght & Skill.
Armads.
Warp Staff and Lalum/Elphin.
2 Characters with Level A on Staff.
And 2 Characters to support the Berserker.