Defeat Piranha Pete
When he opens his mouth, keep spraying water into it until he falls down. Then do a Ground Pound onto the little bump on his stomach . Do this three times to defeat him.
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In the second battle with him, get to a high place and spray him with water. He will fall to the ground. Then, go face to face with him and he will try to spit sludge. Before he does, spray water into his mouth and repeat the process as done during the first battle. Do this three times.