Palman is a boss character encountered in Fire Emblem: Thracia 776.
Palman's defense is a near-perfect 28, but he is still statistically on par with Largo, a boss fought at least seven chapters earlier. He has the same critical weaknesses to magic, armorslayers, and Pursuit Criticals that all generals are saddled with. The player will almost certainly have the resources to plow through Palman, but his defense might delay the battle. The Ballista units near his position will likely prove to be a far greater threat.
Unless the player intends to capture every single capturable boss, there is virtually no reason to capture Palman.