How many movies have Kappei Yamaguchi and Michiko Notsu collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: Curse of the Sacred Sword (2004) while their highest rated movie together was One Piece: Giant Mecha Soldier of Karakuri Castle (2006). They have not worked together since One Piece: Giant Mecha Soldier of Karakuri Castle (2006).