From the Super Mario Wiki
The Chuckolator is a boss in the game Mario & Luigi: Superstar Saga.
It was created by Bubbles, the founder of the Chuckola Cola Company, to protect his Chuckola Reserve, which he had been working on for 1,000 years. Because he is so overprotective of his reserve, he sets the monster out on Mario and Luigi in an attempt to stop them from destroying or stealing it. The Mario Bros. must then engage in battle with the Chuckolator.
It starts out with a shield, which protects it from hammer attacks. The Bros. must destroy this shield, as the Chuckolator is extremely resistant to jump attacks. Chuckolator can attack by sending bubbles of soda, which must be jumped over, or by sending long snake-like soda monsters, which must be Hammered. After repeated hammer attacks, the shield is destroyed and the boss is forced to fight without the shield. However, in this form, it can use both of the above attacking methods multiple times in one turn.
After enough damage is dealt, the Chuckolator collapses into a smaller form. In this form, its only attack is a ramming attack that may Poison the Mario Bros.. Also, Bubbles comes after every turn and tells jokes to it, restoring up to 17 of its HP.
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