Mew works very well, except he is like a rusty train...
He takes a while to get going but once he is going he can't be stopped
You HAVE to get good TMs there in order to beat it. Some are thunderbolt, bullet seed, ice beam, and the best of all... frustration! It does a set 45 damage when your IQ is 0. That is very good a reset to lv 1 dungeons
I've gotten to floor 64 right now. I waiting to be rescued though...
Charizard's heat wave has low pp, I used it on an all grass monster house and died because of pp issues, and because of eevee, Zigzagoon pwns, a little, I only got to floor 43 though, Oh well, I usually do the pichu family.
I used cubone last night because i like him and hes good if you can grow some levels. He only needs 10 exp. till i think level 5 but he doesnt have a lot of health at level 1. so you need to watch out.
just bring anyone and if you have a pass scarf use it! it may suck away at your belly but you will never ever get touched and all of your items you bring will be huge apple and bring one reviver seed.