How does Star Platinum get the same ability as the World?


We don't usually see "Stands" with the same ability. How does Jotaro develop a
power similar to Dio's in the final battle. And now, everytime he uses his
stand, he shouts out "Star platinum the World" as if he adopted Dio's power.
What happened in the final fight with Dio?




While Star Platinum has a bad habit of pulling new abilities from underneath
his loin cloth (I'm looking at you, _Star Finger_ ), I don't think it's the
case here. I think it was implied that Star Platinum had the _Time Stop_
ability the whole time.

When Jotaro confronted Dio, he quickly figured out that their stands were very
similar in terms of speed, range, strength, size and what not. And once
Kakyoin figured The World's secret ability, it dawned on Jotaro that Star
Platinum might have a similar skill.

Of course, he couldn't trigger it easily. At first he was merely able to see
glimpses of the stopped time, then he's able to move in it for a moment and
only at the very end does he finaly manage to stop time on his own.

Not all stand abilities are known to their users instinctually. Even Dio
discovered the _Time Stop_ by accident while training. He also had to train
his ability to extend its length and his movement in it.

While never actually explained, the most likely reason their stands are the
same type is their macabre family connection. Jotaro shares a bloodline with
the body Dio currenlty posesses (through the world's first vampire to human
head transplant).

To put it simply:  
[![Dio \(in for of the devil\) telling Jotaro that he had the talent in
himself all
along.](https://i.stack.imgur.com/GTYHI.png)](https://i.stack.imgur.com/GTYHI.png)

