Okay going to Serebii i found out this also from The official Site.
Plus official site shows how to get it through Wi-Fi you may not know...
Quote:
In The Games Department

US Secret Key Event Announced

Today, the official US site announced the details of the US Secret Key events. Like in Canada, there's a brick & mortar event in Toys 'R' Us stores from April 19th to April 26th. In addition to that, it will be available of the Mystery Gift over WiFi Connection in Pokémon Platinum from April 20th to May 12th. Be sure to download it or go and get it from Toys 'R' Us. Click the picture to go to the page detailling Rotom's form changes


So everyone with Platinum we have our chance now for Secret Key for the Rotom Form!



Now is it possible to get the Wi-Fi secret Key and the TRU secret key lol
i'm being silly

Edit: Just noticed that it was in the upcoming event thread i really didn't notice sad
Nadian you can delete if you like unless other people don't check like me for some reason.