Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness are the second installments of the Pokémon Mystery Dungeon series. Like the first installment, Pokémon Mystery Dungeon: Blue Rescue Team and Pokémon Mystery Dungeon: Red Rescue Team, you, a human, one day transform into a Pokémon and are transported to a world inhabited only by Pokémon. You are then thrown into an adventure with your partner Pokémon to go through dungeons, fight Pokémon, and discover why you have became a Pokémon in the first place. The theme in this installment is "exploration". It contains all the Pokémon through the fourth generation except Arceus.