The Iron Giant (1999) on Netflix

Set in the 1950's, Hogarth, a young boy from Maine, befriends a massive robot that crashed onto Earth, the Iron Giant. While developing a friendship with it, Kent Mansley, a government agent, will stop at nothing to destroy it, and will not change his mind. Because of the boy's attachment with the robot, he'll try to stall Kent's progress, such as using a different chocolate for Kent's sundae. He's also kept the robot at Dean's scrapyard, despite his reluctance to keep him there. But their mutual hatred of Kent's cruel intentions might just keep the friendship between them.