At the Kecleon brothers' shop in Treasure Town, there is a green and a purple Kecleon. Most would quickly jump to the latter being a Shiny Kecleon (one only found in every 1 in 8,192 encounters in the mainstream Pokemon games), but this is untrue: a Shiny Kecleon is green, but in lieu of a red stripe it is light-blue. In other words, it is a completely new type of Kecleon not seen in the mainstream games.
In this game, 492 Pokemon are available out of the 493 encoded into the mainstream DS Pokemon games. The only one not present is Arceus, likely because Arceus continued to be unreleased even in 2009 when Explorers of Sky was released, though his existence was well-known because of cheat devices and the spreading of such info. Arceus is still referenced, however, in this game: a statue of him lies at the end of the most difficult dungeon in the game, Destiny Tower.
During the course of the game, you will travel to the future and, there, meeting the time-traveling Pokemon Celebi. Veterans of the Pokemon series may find it odd that this Celebi is colored pink. Most people attribute this to the Celebi being female, but they're wrong - it's actually because the Celebi is a Shiny Pokemon. Shiny Pokemon are an extremely rare variety of Pokemon found in the mainstream games in about 1 in every 8,192 encounters; however, most people won't recognize the Celebi as Shiny since you would have to hack the games to find it, every distribution thus far being simple downloads or engineered to prevent Celebi from being Shiny. (In fact, Celebi, as of the release of Pokemon X/Y, is "Shiny-Locked" - that is, can never be Shiny.)
Games in the mainstream Pokemon series commonly have an "expansion" version, such as Pokemon Crystal to Pokemon Gold/Silver or Pokemon Platinum to Pokemon Diamond/Pearl. Pokemon Mystery Dungeon: Explorers of Sky marks the first example of this outside of the mainstream Pokemon series.
The layout of the world map between Pokemon Mystery Dungeon: Red/Blue Rescue Teams and Pokemon Mystery Dungeon: Explorers of Time/Darkness/Sky is unusually similar. This is a possible indication that the Mystery Dungeon games take place in the same world, but, due to the slight geographical differences (which can be attributed to geologic processes such as erosion), a great time has fallen between the two games.
Chimecho, breaking the fourth wall: I understand how you feel... Even if you select the "No", you eventually have to select the "Yes", so it ends up the same eventually anyways...
Wigglytuff: Urrrrrrrrrr...! Urrrrrrrrrrrrrrrrr...!
Wigglytuff: Urrrrrrrrrrrrrrr....! YOOM... TAH!
Chatot: Squawk! Squawk!
Dusknoir: A human... with the Dimensional Scream ability... You... are...? You said you know your name, at least? And... that name would be...?
(You told your name to Dusknoir)
Dusknoir: Ah! I see... You're...
Partner: Does that name mean anything to you?
Dusknoir: ... No. It means nothing to me, unfortunately.
You: (Uh, what?! Did I just see... the faintest... Did Dusknoir just hide the faintest of smiles?)
Statue Atop Destiny Tower: "Across time and space... one heart..."
Player: (Is this the Legendary Pokemon Arceus who created everything...?)
Loudred: Ugh... Our Guildmaster is really a special guy... Special in all sorts of ways...
Partner: Be brave! Be the bravest ever!
Chatot: Guildmaster! Please issue the call to duty! ... Guildmaster! Hmm...? Guildmaster! Guildmaster! Are you with us?!
Wigglytuff: ... Zzzz....
Sunflora: (He's fully asleep! With his eyes wide open too! Ewww!)
Chimecho: (Eeep! The Guildmaster is so very charming... sigh...)
Loudred: (You think that maybe he's been asleep from the get-go?)
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