Donald's knock included 15 sixes, with his 200 from just 123 balls equalling the mark set by former India international Shastri in his home country in 1985.
The 19-year-old came to the crease at Colwyn Bay with his side 96-3 in the County Championship encounter, and immediately went on the attack before reaching his maiden Championship ton with a six.
He also brought up both his 150 and 200 with sixes, before holding out to long-on after racking up 234 from only 136 deliveries. Glamorgan ended the first day on 491-8.