Garp. Garp is known as one of the strongest Marines in history and has his incredible fighting ability and battle instincts to thank for that. What makes Garp stand out most of all is his mastery of Busoshoku Haki. Garp is probably one of the most proficient Busoshoku Haki users in all of One Piece.
They didn't faint to the clashed of garp and chinjao which means garp does not have conquerors haki.
He is a top-tier character with insane strength. A huge testament to his strength is that Garp was able to crush mountains with his bare fists. This is no ordinary feat considering that Garp has no devil fruit powers to help him out. Another testament to his power is the Don Chinjao incident.
Episode 649- roughly 12 minutes in when Garp fights Chinjao and their fists collide, you can see the same lightning that Luffy and Chinjao produced. This is enough evidence for me to believe that YES, Garp does use conqueror's Haki.
Koby possesses the ability to use Busoshoku Haki.
Due to the passage of time and Garp's training, Coby has grown thinner and taller, standing close to Luffy in height. He has also gained a cross-shaped scar above his right eye, presumably earned under Garp's heavy-handed tutelage.
Kid was confirmed as a user of Conqueror's Haki by Kaido. Whether or not he has control over his Conqueror's Haki is unknown. Biggest Feat: Eustass Kid finally got his moment in the Wano Country arc when he managed to defeat Big Mom, albeit he required a lot of help from Trafalgar Law.
4 Stronger: Garp
Despite being a Vice-Admiral, his strength surpassed that of an Admiral. Garp has previously fought characters such as Roger and Whitebeard and is spoken about in the same breath as them. Someone like him is bound to be stronger than Dragon, at least in his prime.
Lucci possesses the ability to use Kenbunshoku Haki.
Edit. Conqueror's Haki is a rare form of Haki that cannot be attained through training. Only one in several million people have this ability. This type of Haki allows the user to exert their willpower over others. It is said that whoever possesses this type of Haki has the qualities of a king.
Garp too had a form of respect for him, as he not only protected Ace but also showed signs of disappointment from Ace's decision to disregard Roger as being his father. Also, Garp acknowledged Roger's strength, stating that although Roger was extremely reckless, that's what made him into the pirate king.
Although he doesn't have a Devil Fruit, Garp's usage of Haki was so efficient that he never needed to rely on one to take on strong enemies. He has been in several legendary battles over the years and has taken down some of the strongest pirates.
Being their strongest known member in history, there's no denying that Garp is capable of taking on Kaido. He's previously fought against the likes of Rocks, and even Gol D.
However, Coby works under evil officials and does the bidding of the celestial dragons to a certain extent, just like all other Marines. It's no wonder that the Marines don't usually have conqueror's haki, and just like everyone else, it is highly unlikely for Coby to awaken conqueror's haki.
BUGGY who sailed with Roger in his final journey and witnessed Prime PK Roger in action stated ONLY one man could match Roger's strength and that man was Whitebeard not Garp.
CP0 is the strongest of all Cipher Pol units, even surpassing the assassination specialists of CP9.
He literally lost the ability to use haki because he lost the ambition that Haki IS. It's not Ki, it's not Chakra, it's not some autonomous spiritual force, it's literally the concept of ambition and will made physical, which means you need to have a dream in your heart for it to work at all.
zoro cant do skywalk/geppou. its not just jump high but using feet to walk in the air.
Shakuyaku. Shakuyaku is Rayleigh's business partner and wife.
Alongside Garp and Tsuru, Sengoku is one of the most powerful Marines of his generation. Even without his Zoan Devil Fruit powers, Sengoku has enormous strength, enough to effortlessly hold down an enraged Garp with only one hand. Sengoku is also a tremendously skilled hand-to-hand fighter.
In vol. 60 sbs Oda said that Sengoku's fruit is a Mythical-zoan type, Hito Hito no Mi, model "Daibutsu".
Marco possesses the ability to use Kenbunshoku Haki.
Jinbe possesses the ability to use Kenbunshoku Haki.