posting help request if /pmdg/ wants to waste a few hours on Rescue Team.
For this run I went in with 20 max elixirs + tight belt and eventually recruited Cordelia (Lv 21 Chikorita) and Loops (Lv 25 Spinda).
We found an Escape Orb on F31. I was really just trying to grind the floors for fun but since I was close to F50 I figured I'd try getting a Chansey first... huge regret...
I made the mistake of stepping on a visible Pokemon Trap on F49 Monster house because I forgot it turns items to Pokemon (it usually does nothing when rooms are empty) and lost an Ice Beam. Loops was lost to the Dugtrio and while Fishe was asleep Cordelia kept spamming a useless PoisonPowder and I could do nothing.
Fishe survived alone and made it to the next floor on 30HP... I thought I'd recruit the Chansey and just leave so it would all be worth something, but an Azumarill took me out.
Overall Max Elixir + Tight Belt can be a fun way to do 99F dungeons (compared to the usual scarf speedruns) but is probably not worth doing.