After being defeated by Luffy and being stripped of his Warlord title,
Luffy vs. Crocodile" is the 110th episode of the One Piece anime.
As a pirate, Crocodile was known to be ferocious, having sailed the seas of the New World in the past. With his Sand-Sand Fruit powers, he was a tremendous enemy for Luffy. Unsurprisingly, Luffy lost to Crocodile twice, although the third battle ended in his favor.
Robin seemingly doesn't use Haki, so that's another major problem. She is also too slow to realistically catch up with Crocodile. Unless Robin can master Busoshoku Haki, she doesn't stand a chance here. There's nothing she can do against Crocodile and his Logia abilities.
1 Luffy Vs.
The fight is, undoubtedly, the most difficult one that Luffy has fought so far. Kaido managed to defeat Luffy three times. For the first time, Luffy faced defeat against him Kuri and was thrown in prison.
The crocodile has the strongest bite of any terrestrial animal at 3,700PSI while also using 66, 4-inch-long teeth on their prey. Sharks have them beat, though. They bite at 4,000PSI with 300 serrated teeth measuring more than two inches.
Crocodile is a formidable opponent, given his mastery of the Suna Suna no Mi. However, he is currently at a disadvantage against Zoro. For some reason, Crocodile has yet to demonstrate any usage of Haki techniques. This is a basic necessity among the strongest One Piece characters.
Out of all the 7 Warlords that fans have been introduced to so far, Buggy remains the weakest. He isn't particularly good at anything, and his Devil Fruit isn't all that impressive either. Buggy's biggest strength so far is being in the right place at the right time, and accidentally rising to power.
Her lifespan was also stolen by Big Mom during one of her cravings-induced rampages. However, ultimately, Big Mom is defeated by Eustass Kid and Trafalgar D. Water Law who sent her flying down into an underground magma chamber and caught in a massive volcanic eruption, which presumably killed her.
In the end, it was not just Luffy's awakening form that single-handedly wiped off Kaido in the battle. Still, the Ryuo technique and Luffy's handiness of Haki also played a vital role in the Yonko's defeat. In the battle, Luffy's Gear 5 transformation was just Kaido's final nail in the coffin.
-Against Smoker in East Blue Luffy got no chance. -We can consider his first formal defeat was against Crocodile (but he won in the end, after losing 2 times).
Luffy's first bounty is 30,000,000 Berries, which he receives after defeating Buggy, Don Krieg, and Arlong of East Blue. His second bounty is significantly higher, at 100,000,000 Berries, after defeating Crocodile of the Seven Warlords of the Sea.
Cobra attacks Luffy but Luffy squirts out water from his mouth and douses Crocodile with water, just as he planned, making the Warlord susceptible to Luffy's physical attacks. Luffy uses his Gomu Gomu no Bazooka technique and hits Crocodile directly to his stomach which sends him crashing.
"Finally Clashing! Pirate Luffy vs God Enel!!" is the 182nd episode of the One Piece anime.
Quite easily one of the toughest battles that Zoro has been in is the one that he fought against Dracule Mihawk, the man who currently holds the title of the World's Strongest Swordsman. Zoro challenged him during the Baratie arc and found out the gulf of power between him and the World's Strongest Swordsman.
Although he did fight Kaido and even managed to earn his praise, which is quite impressive, it was pretty clear that Zoro wasn't anywhere close to him in terms of either power or skill. That in itself is a big reason why Zoro would never have killed Kaido. For now, Zoro is levels below his Captain, Monkey D.
Crocodile was the main antagonist of the Alabasta saga and among Luffy's most iconic enemies. Although the former warlord did not have access to Haki, his versatile Devil Fruit compensated in many other ways that made him a threat to be remembered.
Ace is older and have been a better fighter than Luffy since they were kids. Combat ignoring devil fruit: Ace 1-0 Luffy. Ace hasn't showed Busoshoku Haki so there's no evidence he could hit Luffy in a open fight. Luffy has that type of haki then he is able to hit Ace even if he turns into fire.
Shanks is stronger and by quite a big margin.