How many movies have Teiichi Saitô and Toshifumi Shimizu collaborated on?

They have worked on 4 movies together! Their first movie together was Godzilla 2000: Millennium (1999) while their highest rated movie together was Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001). They have not worked together since Godzilla: Final Wars (2004). They are most known for their science fiction films together.