Option 1: Pulakeshin-I was the founder of the Chalukya dynasty and ruled in the early 6th century. His timeline did not coincide with Emperor Harsha`s.

Option 2: Pulakeshin-II, on the other hand, was a Chalukya king who ruled in the 7th century, during the same period as Harsha. History records show that during Harsha`s attempt to expand his empire in the south, he was stopped by Pulakeshin-II at the Narmada river. Hence, this is the correct answer.

Option 3: Vikramaditya-I was a Chalukya king but he came years after Pulakeshin-II and did not directly clash with Harsha.

Option 4: Vikramaditya-II reigned even later than Vikramaditya-I and his rule did not overlap with Harsha`s reign.