Vs. Recorder
The Battle Recorder (Japanese: バトルレコーダー Battle Recorder) is an item exclusive to Pokémon Platinum Version, yet to be released.
It is confirmed that the Battle Recorder can record and replay a player's battles, similarly to the Frontier Pass's Battle Record, and send them over Nintendo Wi-Fi at the new and improved Global Trade Station in Jubilife City. It can also take pictures of the player's boxes. It is still unknown if the player can record online battles or in-game battles.
Modes
There appears to be several features and modes on the Battle Recorder apparently using the Nintendo DS's touch screen to operate. There will be a mode in which the player can send and receive recorded battles via Wi-Fi, as well as a mode in which recorded battles of other players can be rated.
Browser mode
The Browser mode is the only mode so far that has been confirmed. Browser mode does not require Nintendo Wi-Fi to use. It can record, replay and delete battles made by the player or a friend.