The Yonko are known to be some of the strongest characters in the world of One Piece. They are the four mightiest pirates of their age who sit atop the era and rule the seas of the New World like Kings. The power of the Yonko is feared by even veteran pirates and high-ranking Navy officials alike.
The Yonko are not pirates to be messed with, and not even someone as powerful as a Marine Admiral can simply engage them on a whim. Given that the Yonko sit at the top of the pirate era right now, there are only a handful of characters who have, throughout history, surpassed this level and become powerful enough to be declared stronger.
The Five Elders are the highest-ranking Celestial Dragons in One Piece that the people of the world know of. They are also the highest authority in the entire world, responsible for running the entirety of the Government. They enjoy the most power and, as such, they don't really step into action often, or ever. However, that doesn't mean that they aren't strong. The Gorosei are all incredibly powerful, as was confirmed in the recent One Piece arcs.
All of them seem to possess Yokai forms that stem from their Abyssal Covenant with Imu. On top of that, they are the personal bodyguards of Imu, which means that their power must be on an entirely different level when compared to the rest of the strong fighters in the world. The Gorosei are certainly in a league of their own and, given that their authority is much higher than that of a Navy Admiral, they are also much stronger.
Rocks D. Xebec is known to have been one of the most formidable enemies that Gol D. Roger ever faced. This statement in itself means that Rocks was a rival to Roger comparable to Whitebeard. Rocks captained the Rocks Pirates, and he had established a mighty group that included three of the future Yonko: Charlotte Linlin, Kaido, and Edward Newgate.
When it comes to power, Rocks was a complete monster, strong enough to make the entire world fear him. He ruled the seas all by himself back in his day, and the Government even declared him a terrorist, based on how he was acting. Rocks met his end at God Valley 38 years ago at the hands of Imu. To free him from his misery, Garp and Roger had to combine their forces, which just goes to show that he was in a league of his own and also the mightiest pirate that the world had possibly ever seen.
Silvers Rayleigh is the right-hand man of the Pirate King and known to be one of the strongest individuals to ever exist in the world of One Piece. In terms of power and authority, Garp compared him directly to Whitebeard, who was a legendary figure considered to be special even among the Yonko. Rayleigh does not have any Devil Fruit ability, and all he relies on in battle is his Haki. He has access to all three types of Haki, and two of them have been advanced to the next level, those being the Color of Armament and the Color of the Supreme King.
In the aftermath of the Wano Country Arc, Rayleigh came face-to-face with Blackbeard, and the latter simply gave up due to the immense fear he had of Rayleigh. While Rayleigh openly stated that he would not be able to beat Blackbeard, he also confirmed to us that the reason behind this was his old age. In his prime, Rayleigh was confident he could take down Blackbeard, which also goes to show that he was stronger than the Yonko.
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