You have him/her as a stater pokemon.
teach it dig or other ground type moves.
Yes, but only in Pokemon Mystery Dungeon: Explorers of Sky.
in mystery jungle after you get secret rank
no
You Can't
No.
You can't breed Pokemon in the mystery dungeon games.
Unfortunately you can get Arceus in Explorers of sky :/ The closest you get to seeing it is a statue...
It's the Darkrai battle, as also seen in Pokemon Mystery Dungeon Explorers of Time/Darkness.
target, gamestop, etc.
you get lucky
you have to be a bubble type