How many movies have Masaaki Tsukada and Yasunori Iwasaki collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: The Desert Princess and the Pirates: Adventure in Alabasta (2007) while their highest rated movie together was A Certain Magical Index: The Miracle of Endymion (2013). They have not worked together since A Certain Magical Index: The Miracle of Endymion (2013).