Who's Joy Boy.....
Who's Joy Boy.....
He was promised to pull the noah back to the surface but failed in it hence the poneglyph said it. I believe it will be Luffy, since king neptune is still awaiting for the person to come who will keep the promise. Also as we know Luffy was predicted to destroy fishman island, I think the work of noah is to destroy it so that fishman can live peacefully on the surface without discrimination.