Suggested by Sonic Maxwell can create just about anything while Duplica has her Ditto which can transform. The question ultimately becomes whether Maxwell’s creations would be strong enough to do much against her. His abilities are very much limited by gameplay mechanics so it’s hard to see just how strong he is. Ultimately Duplica’s Ditto isn’t the strongest Pokemon though so I think Maxwell’s got enough explosives and tech to take her out here. Ditto wouldn’t be able to effectively protect Duplica. Maxwell wins.