Which area in the game yields a lot of brigand king plates? I am getting them rather infrequently.

<t>Hi, I am new to this forum and almost at the end of this game. Lucas, Iria, Melvin, and Elodia are close to level 60. Their jobs respectively are lionheart, neo- dragonite, brigand king, and sorcerer. I already  got creamed three times by the red dragon. My question is what are the suggested leve...