The Mystery Dungeon series is the ugly side of the Pokémon world and while there is some fun to be had in some of the games, Explorers of Sky is actually the worst of the lot.
As is the case in all the games, Explorers of Sky casts the player as a human who mysteriously wakes up one day to find that they have somehow turned into Pokémon but have no memory of how it happened (meh, we've all been there after a particularly heavy night...) and of course, the best solution to this turns out to be forming a rescue team and crawling into a selection of very samey dungeons. Not only is the story very fmiliar to anyone who has ever played any other episode in the series but it turns out that it is in fact a remake of the Explorers of Darkness and Explorers of Time games.
Thankfully it's nice all bad; there's loads of pokémon to spot and recruit, the back stories that accompany your rescue missions are almost all very cute and the graphics, while not quite state of the art, are really charming and pleasing to look at. However, considering the fact that this is a dungeon crawler game and all the dungeons are practically identical to the first mind-numbing dungeon that you enter is a bit of a deal-breaker for all but the most hardened of Pokémon fans.