How many movies have Hitoshi Kamata and Yuuji Ikeda collaborated on?

They have worked on 4 movies together! Their first movie together was Dr. Slump: Arale's Surprise Bang (1999) while their highest rated movie together was Digimon Tamers: Battle of Adventurers (2001). They have not worked together since One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008). They are most known for their animation films together.