2 Kaido. The man known to be the strongest creature, Kaido is widely known to be the most powerful pirate right now, and the mightiest of all Yonko currently. He was an apprentice on Rocks D.

Who is the weakest of the Yonko?

Shanks is the weakest Yonko.

Who is the strongest of the 4 Yonko?

Known to be the strongest creature on land, air, and sea, Kaido is one of the Four Emperors, just like Big Mom, and has a bounty of 4,611,100,000 Berries on his head.