Fire emblem how to defeat merach?

To defeat Merach in Fire Emblem, focus on exploiting his weaknesses, particularly using characters with strong magic or effective weapon types against him. Ensure your units are well-leveled and equipped with effective skills or items. Position your characters strategically to avoid being overwhelmed, and consider utilizing debuffs or status effects to hinder his performance. Lastly, keep an eye on your own units’ health and engage in a coordinated attack to take him down efficiently.