You will have to delete the game. It also depends on which Pokemon Mystery Dungeon Game you are talking about. But, there should be an options button in the menu. If there is, click on it, and there should be an option "delete saved game" Hope this helped!
yes
Pokemon cannot be traded in the Mystery Dungeon series.
No.
go on the adventure log on the main menu then press delete saved data
NO
If you get all the Pokemon and 99 of all items you can restart the game and be Jarachi as a starter.
there is no Pokemon mystery dungeon shadows of almia....
Yes, but only in Pokemon Mystery Dungeon: Explorers of Sky.
Pokemon cant on mystery dungeon
You can't breed Pokemon in the mystery dungeon games.
Pokemon mystery dungeon explorers of time.
Yes there is a unknown dungeon in Pokemon blue mystery dungeon! You'll have to connect with your friends if you want to go there