Due to its high value, counterfeit copies are common. To verify an authentic US copy, look for: Pokémon Platinum Review - Nintendo World Report
Game Report: Pokémon Platinum Version (US) is the definitive "third version" of the fourth generation of Pokémon games, released as an enhanced update to Pokémon Diamond and Pearl . Core Game Information Release Date (US): March 22, 2009. Platform: Nintendo DS. Developer/Publisher: Game Freak / Nintendo. Mascot: Giratina (appearing in its Origin Form ). Region: Sinnoh. Key Features & Enhancements Pokemon Platinum Version (US)
Two years passed and then Pokémon Platinum arrived. Platinum is the DS equivalent of a double-dip, and lines right up with Yellow, Nintendo World Report Pokemon Platinum Version Videos for DS - GameFAQs Due to its high value, counterfeit copies are common