Summary
God Valley is a place of great significance in the world ofOne Piece. This island was first introduced inOne Pieceduring the Wano arc, right in between Act 2 and Act 3 of the story. It was revealed that on this island, Celestial Dragons were once attacked by Rocks Pirates crew.
Eventually, many powerful forces assembled here and took part in a giant event that came to be known as the God Valley Incident.With the current events on Egghead, more information about the God Valley has been revealed and, over the years, some of the strongest characters in the world ofOne Piecehave made their presence known on this island.

8Kaido
Kaido was one of the Four Emperors of the Sea until recently. During the time of the God Valley Incident, Kaido went to God Valley. He was still very young and certainly far from his prime.
He also did not have his devil fruit at the time, which once again indicates that he was not all that strong. Yet, he was one of the few survivors from God Valley. He was saved by Big Mom, who ended up giving himhis Devil Fruit, the Uo Uo no Mi, Model: Seiryuu.

7Shiki
Shiki was an underling of Rocks and a very powerful pirate during this time. However, even he was far from his prime during the God Valley Incident. Yet, he likely took part in this war and ended up fighting against the Celestial Dragons and, most likely, the Navy as well. What happened to Shiki during this war is unknown.
Fans do not know if he was defeated, or if he retreated or simply did not take part at all. Much about this incident remains covered in mystery, however, what fans can be sure about is the fact that Shiki had only just started his pirating journey to the top.

6Charlotte Linlin
Charlotte Linlin was a powerful pirate present on Rocks' crew. Fans know that she went on to become one of the Four Emperors of the Sea in the future of One Piece, however, at this time, she was not in her prime.
Still, fans can be sure that Linlin was likely much stronger than Kaido at this point in the story, given that she used to look after him and was also the only reason why he survived to live as long as he did. Linlin was very powerful and, given the fact that she saved Kaido, it can be assumed that she was not defeated in this war. How exactly she retreated from God Valley remains unknown at this point in time.

5Edward Newgate
Just like Linlin, Newgate was also far from his primeduring the God Valley Incident.At this point, he was likely much stronger than the likes of Kaido. Fans know him to be a fully grown pirate at the time of the God Valley Incident. He was also likely second to Rocks himself.
It is likely that he did not have the name Whitebeard at the time, given that he had not started his crew yet and was likely not as famous all over the world. However, after the fall of Rocks, he went his own way and created his own pirate crew. What he did in God Valley is unknown at the moment.

4Garling Figarland
Garling Figarland Is one of the Celestial Dragons who stems from the holy Figarland Family and the man known as the Champion of God Valley.He was seen in God Valley during the God Valley flashback.
In terms of appearance, he looked just like Shanks back then, with a different hairstyle. In terms of power, fans can also expect him to be tremendously strong, given that he shares his bloodline with the red-haired Emperor. As the champion of God Valley, it can be considered that he used to take part in the tournament held in God Valley. His strength must have been immense, however, fans have not seen much of that just yet.

3Garp
The legend of the Naval Hero, Garp, began in God Valley nearly 38 years ago. On that day, he teamed up with Roger and took on Rocks, the mightiest pirate of the time.
Together, these two managed to defeat him, however, all credit for this was given to Garp. Given that he was strong enough to take on Rocks and even defeat him, one can assume that he was certainly among the strongest fighters in God Valley.

2Roger
Roger was a known enemy of Rocks at this time. According to Sengoku, Rocks was the biggest enemy that Roger ever faced in his life, even bigger than Whitebeard.
These two characters had a rivalrythat finally concluded in God Valley.With the help of Garp, was successful in defeating Rocks for good. Although he did not get any credit for it, his power had only started to grow even further.

1Rocks
Quite easily, the strongest character to have ever stepped foot on God Valley, according to the knowledge of the readers at the moment, is Rocks.
He led his entire crew, the Rocks Pirates, to God Valley and attacked Celestial Dragons. Eventually, he was faced by the combined force of Roger and Garp. Together, these two ended up defeating Rocks and crushed his pirate crew for good.