Explorers of the Sky was released in Japan on April 18th 2009 and is a continuation of Explorers of Time and Darkness. Along with the standard dungeon crawling experienced in the previous titles, you're also given the chance to play through special episodes where you take control of characters such as the Guild Master and Grovyle.
Origin Forme Giratina and Shaymin's Sky Forme are both obtainable however you cannot play as Rotom's new formes or as Arceus however an Arceus statue does appear in the Destiny Dungeon.
A new building appears in Treasure Town called the Spinda Cafe, here you can turn berries and seeds into drinks which work the same way as items. Whilst exploring dungeons, you may come across a secret set of stairs which will take you to Secret Bazaar which contain four stalls run by Swallot, Shedinja, Lickilicky and Mime Jr.