You need to download software and update it over the pc.
Why Doesnt My Action Replay Accept Game Id For Pokemon Platinum?
Your action replay may be messed up.
Press start when you add id
Maybe its code no is wrong
When you put your action replay in start it, and put into the main menu then put your game in. Under where it says ''UNOWN GAME'' there will be a number underneath it, that's your id code
Because, if you added any other codes like walk through walls or anything like that then the replay will count any other games with that cheat and the replay will think its that other game!!!
Mine dose that 2 and I'm so sad and I read on another site that platinum's id code iz unknown... I dident belive it.