Preheat the oven to 350 degrees.
Grate the zucchinis and set on paper towels to absorb excess moisture. I ended up with a couple of cups of grated zucchini but it honestly doesn't affect the recipe if you have more or less. I would say between 2-3 cups is perfect.
Combine sugar, eggs, applesauce, zucchini, butter, and vanilla in a large bowl.
Combine the chocolate chips with a couple tablespoons of the flour to keep them from sinking to the bottom while the cake is baking.
Stir in the flour, baking soda, salt, cinnamon, cocoa powder, and chocolate chips.
Stir until all ingredients are thoroughly combined.
Pour the batter into a well-greased bundt pan. Bake the cake for 60-70 minutes or until an inserted toothpick comes out clean. Let the cake cool for ten minutes before inverting onto a plate.