How many movies have Masanori Nishii and Satoshi Iwataki collaborated on?

They have worked on 2 movies together! Their first movie together was RahXephon: Pluralitas Concentio (2003) while their highest rated movie together was Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014). They have not worked together since Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014).