The Lost Wilderness will be available (I don't know when...). You will occasionally receive a mission on the bulletin in the Guild that will send you with your client to an unknown territory. There are so many, it probably won't be the Lost Wilderness first time you have to explore unknown territory. Just keep going on missions consistantly, and it will eventually appear on the bulletin board.
arceus isn't in Pokemon mystery dungeon 2. he is maybe in Pokemon mystery dungeon 3.
no
you cant
50
aegis cave
yes
who cares pokemon are gay.
I think its charmander and riolo
yes
YFTE-ABF3F3F2
codejunkies
defeat darkrai mission