How many movies have Hiroaki Hirata and Hirohiko Uesaka collaborated on?

They have worked on 4 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 One Piece Film: Strong World (2009). They have not worked together since One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014). They are most known for their adventure films together.