Is Platinum a remake of Diamond and Pearl?

Answer 1

Technically it depends what you mean. The story line has changed. Team galactics leader Cyrus now appears at the beginning of the game. And, insted of accidently stumbling on Prof. Rowans briefcase at lake verity, he offers you Pokemon just north of Twinleaf. And, after the main team galactic event (Diamond = Dialga, Pearl = Palkia and Platinum = Giratina) the new team galactic proffeser (Charon) takes over and tries to capture heatran on stark mountain. Not only that, but both dialga and plakia can be caught at level 70 after completing the Pokemon league. AND heatran is now caught at level 50 insted of 70. There are many more, like the roaming Zapdos, Moltres and Articuno. And, of course, Sky Forme Shaymin, the Rotom Formes and Origin Forme Giratina. With extra apperances of Looker, and international police officer. And, the team galactic buildings have had and interior and exterior makeover. Now, the sinnoh dex has 210 Pokemon in it, insted of D/P's 151. Many Johto and Hoenn Pokemon also make an appearance in the new Sinnoh Dex. And, lastly and most important, The old battle zone, home to the Battle Tower, is now known as The Battle Frontier.

p.s almost forgot, in the survival area, you can visit a cafe and rebattle gym leaders and challenge old battle parteners like riley and cheryl.