Board Thread:General Discussion/@comment-1739368-20121205124732/@comment-32973614-20190311165921

Diavolo vs Dio:

Diavolo can erase 10 seconds and predict what happens within and only within that time, so, if he erases time, to him, it would look like Dio instantly changes position and has already hit his position with a barrage of punches, Diavolo would predict this without understending the reason for the sudden change in position, and just not be in that place, so he would be almost unaffected by the world, unless Dio activates the ability first and kills Diavolo, who would be unable to react as time is frozen.

I'd say that the 2 would be on equal ground, whichever activates his ability first prevents the other from using theirs to defend.