What is the strongest Boss in the Entire Kirby Series

Well, there are many tough enemies, but theese are strongest: Marx, Marx Soul, Galactic Knight, 02, Masked Dedede, Daroach, Dark Daroach, Mecha Kracko, Meta Knigt, Miracle Matter, Fatty Whale, Dark Matter, Dark Mind, Heavy Lobster, Dyna Blade, and Captain Stich. The EASIEST: Bandana Waddle Dee, Ax Knight, Lance Knight, You know, any other swallowable Bosses.