There are two stages during the Diababa boss battle. For the first stage, use the Gale Boomerang to get one of the Insect Bombs inside the mouths of the two giant Babas sticking out of the water. After they’re defeated, the main body will appear along with two heads. Now use the targeting system to get the bomb from the baboon to the main body. It will fall, giving you an opportunity to attack with your sword. Diababa will then start shooting poisonous water at you, which is hard to dodge. Repeat until you defeat Diababa. Note: Make sue to target both the bomb from the baboon and Diababa.