On Serebii's page for Legendary Pokémon in Pokémon Mystery Dungeon: Explorers of Sky, it says that Zapdos can be found on the 7th floor of the Electric Plateau if an Enigma Part or Secret Slab is in the bag. However, in that same Serebii's
Dungeon List, it does not have any information on the Electric Plateau! How do I unlock this dungeon?
EDIT: There is also no information on how to unlock the Great Volcano, where Moltres resides.
There is no "Electric Plateau" dungeon Zapdos is in Amp Plains