One of Hybrid Kaido's islands is still ?

[Sylais]

Howdy
So I'm missing one last island on Hybrid Kaido's growth map 1. Specifically it's the island on the bottom row, second from the left, down from the small health upgrade. Anybody know what coin I need to collect to unlock that island?

https://steamuserimages-a.akamaihd.net/ugc/2109429809945933808/FF4DD9ACCC2ED2FF1DE398EBD9968F7216C0BDA2/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

[Mateo]

It's the poneglyph gold coin. You need to clear "Croco-scum and Dofla-dingus" in the grand line treasure log.

[Sylais]

Thanks so much, it's been driving me nuts