The game takes place in Sinnoh, which is based on the island of Hokkaidō in Japan. The new criminals are Team Galactic. The game features an updated day/night system, as well as Pokémon Contests, the Battle Tower, a Pokétch device, and Wi-Fi abilities.
You can battle and trade using the Wi-Fi connection. Diamond and Pearl is also be able to connect to the Wii game Pokémon Battle Revolution, where you are able to trade Pokémon from Diamond and Pearl to Battle Revolution and vice versa.
Also, you are able to transfer Pokémon from the previous Game Boy Advance games onto Diamond and Pearl after reaching a certain point in the game. You must have the GBA game in the GBA slot of the original Nintendo DS or DS Lite to do this.
As in every Pokémon game (with the exception of Yellow), you must choose one of three pre-selected Pokémon to be with you in your party. The three new Pokémon this time around are Turtwig, Chimchar, and Piplup. The starters then evolve respectively into Grotle, Monferno, and Prinplup. The final evolutions are Torterra, Infernape, and Empoleon.
Once it was released in Japan on September 28, 2006, it was the fastest selling Nintendo DS video game to date, and has since been the best selling Pokémon game in Japan, selling a whopping 5 million copies in a few months.
Additionally, in preparation for the game to arrive, sales on previous Pokémon Game Boy Advance games has boosted.
The reception was very good. From IGN.com, who awarded it a 8.5 out of 10 to GameSpot.com who gave it another 8.5 out of 10, it was greatly liked. When reviewers fell in love, the public followed. All users adored the game. Many of this great reception is for the touch screen interactions, better and smarter A.I. in battles, improved graphics and a great Lasting Appeal, and also for it's length of 40 hours.
Pokémon Platinum is an enhanced remake of Pokémon Diamond and Pokémon Pearl. It has a few new upgrades and the Battle Frontier has returned. It has the Pokémon Giratina as its mascot. It also had a few minor changes like meeting Cyrus in the beginning of the game and newer forms for Rotom, Shaymin, and Giratina.