OK, thanks to Sirolu, I got all the way to B57F.
Right on that floor I saw stairs. I didn't go on them yet, because I wanted to defeat the Drapion in the room. So I proceeded to fight it. But then, unexpectedly, it defeated me.
So I need to be rescued again.
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I strongly suggest you use Smoochum. I cannot stress this enough. Her Forewarn has saved my butt countless times. And Powder Snow, which it learns early on, is a very good move that can hit multiple enemies at once, can save your life when cornered/in Monster Houses, and can be powered up even more by Ginsengs that you will inevitably find. If you find a Hidden Power TM, use it! It can really come in handy when you find yourself out of PP or have no effective move options. Confusion and Lick are very useful against Fighting, Poison, Psychic, and Ghost types.
So your moveset should be like this:
Pound ---> Any good attacking move, if you find a TM of it, like Hidden Power
Lick
Sweet Kiss ---> Confusion ---> Psychic (if you find a TM of it)
Powder Snow ---> Ice Beam (if you find a TM of it) ---> Blizzard (if you find a TM of it, or get to level 45)
---> represents what moves should be replaced with; if you find a Blizzard or Psychic TM, and you have Powder Snow or Sweet Kiss, respectively, replace the latter with the former, and don't learn Ice Beam or Confusion, respectively.
So, that's how to get through Zero Isle South, rescue me, and maybe even complete the dungeon.