HP 60 20 st from 20 and the all have 20 hp

Another complete joke of a boss (like Doopliss for example?). Not on your life. Cortez is by far the hardest boss we have yet to face with the highest HP and swords that can slice you in half. Anyway I'd recommend Mario and Vivian for the majority of the battle and a good 5 SP is very helpful. Anyway Cortez has three forms the first two having two targets: a head and section of bones. Every 20 damage you give to Cortez he will change forms. The first form is really easy though. Use some minor items like Mushrooms when Cortez deals lots of damage out not major items such as Whacka Bumps or Ultra Shrooms. Try not to use too much FP just 5-10 or so. Eventually the bones around Cortez's body will weaken and that's his next form. Sounds like he'd get weaker but he didn't. In fact, he'll spend a majority of the fight prepared for a bone attack in which will do 7 damage or so to both of your characters. Not a thing I like. Do not use Sweet Treat, no matter what. Beat up on Cortez with power but try not to waste Power Bounce and instead use Fiery Jinx and Power Smash to hurt the bone pile until Cortez's body falls to pieces and he'sleft with only a skull and four weapons: swords rapiers hooks you name it. Believe it or not,this is BY FAR his toughest form. The swords all have 4 HP, but you cannot jump them. And you cannot hammer them either. And they defend Cortez. Combining the Cortez party will all do about 10-12 damage to both Mario and his partner here which is not something you want to face. Start by launching your all-out offensive! Use Art Attack, and make sure you circle around EVERYTHING. Cortez will suffer quite a bit through that, although he'll eat the souls of the crowd afterwards. Remember Hooktail doing that? And the swords will quickly get up. But we don't have time to bother with those now do we? While you're still alive switch Vivian out for Goombella and Power Bounce and Multibonk Cortez to the very last of his days! It matters! Don't bother with defense except maybe to cast Sweet Treat so that you can restore your HP and FP. Trust me on this; this battle is really tough so it's quite easy to
understand if you lose.