How many movies have Hayao Miyazaki and Sunao Katabuchi collaborated on?

They have worked on 4 movies together! Their first movie together was Sherlock Hound: The Adventure of the Blue Carbuncle / Treasure Under the Sea (1984) while their highest rated movie together was Sherlock Hound: Mrs. Hudson Is Taken Hostage / The White Cliffs of Dover (1986). They are most known for their animation films together.