How many movies have Eiichiro Oda and Kazuhiro Nishikawa collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: Dead End Adventure (2003) while their highest rated movie together was One Piece: Baron Omatsuri and the Secret Island (2005). They have not worked together since One Piece: Baron Omatsuri and the Secret Island (2005).