The official Mystery Dungeon website has announced two new Wonder Mail W (ふしぎなメールW) events will be available starting Thursday October 15th. Giratina and Dialga will both be available. Players will have the chance to challenge both of these Pokémon.
![pic](http://www.pokemon.co.jp/special/dungeon_boukendan/friend/images/img-friend-wi-fi-09.jpg)
![pic](http://www.pokemon.co.jp/special/dungeon_boukendan/friend/images/img-friend-wi-fi-06.jpg)
Be sure to keep your Nintendo Wi-Fi connection active on October 15th as Palkia will also be available via WiiConnect24 the same day as the other two Wonder Mail W events.
Source:
http://www.pokemon.co.jp/special/dungeon_boukendan/friend/wii-wifi.html#ttl02