Due to its high value, counterfeit copies are common. To verify an authentic US copy, look for: Pokémon Platinum Review - Nintendo World Report
Added new forms for legendary Pokémon like Rotom, Shaymin, and Giratina. Market Analysis (Current Value) Pokemon Platinum Version (US)
Pokémon Platinum introduced several refinements over its predecessors to create a more polished experience: Due to its high value, counterfeit copies are common