DIO Diary

A DIO's Diary will evolve a certain stand to another certain stand that is stronger.

You can get your hands on one by purchasing the DIO Diary gamepass or begging an admin for one. I wouldn't recommend the second one though. BUT, you can also get a DIO Diary by completing Jotaro's quest.

 List of stands that can be used with a DIO Diary: 

Star Platinum - Star Platinum Over Heaven

The World - The World Over Heaven

Whitesnake - C-Moon C-Moon - Made in Heaven