The Zero Isle dungeons in the Pokemon Mystery Dungeon series (Explorers of Time, Darkness, and Sky specifically) are much more similar to a typical roguelike, adding restrictions that make the dungeon difficult to complete (and forcing you to rely on luck a little more). In particular, Zero Isle South makes you enter with no money, no items, and (for the dungeon) resets your Pokemon's level to 1.
However, there are definitely some Pokemon that are better than others for attempting to complete the dungeon. For example, Mew is a great Pokemon because it can learn all TMs you pick up. What other Pokemon are good for completing Zero Isle South?
Best Answer
I would either use Rotom or Mew.
I used Rotom for my first trip into this dungeon and got to the 64th floor before fainting. I'd say that's pretty decent for a first try!
Anyways, Rotom's a ghost type so in emergencies you could just go into a wall and attack from there. Also, Rotom knows Confuse Ray right from the start, which helps a lot.
Mew is great for this dungeon because he's got great stats and can learn every TM move, which this dungeon has a lot of. I could easily get to the higher floor levels with this pink destroyer.