I am currently doing a new run cause i got bored, and i have been following your guide quite closely and it has been very helpful for me since i have not played it in months. Currently i have reached part 13 and hope some of this info helps (:
(Lv. dunno) OR(Lv. dunno)
The Houndour found at Team Magma's hideout if you joined Team Aqua is @ level 22
The Carvanha you receive from Team Aqua's leader with the same choice is @ level 20
(Lv. ?) OR (Lv. ?) OR (Lv. ?) OR (Lv. ?)
I manage to encounter a golett @ level 35
(Lv. 28)
The Nidorina i encountered had
Double Kick
Venom Drench
Bite
Disable
So i assume the egg moves given should be disable and venom drench?
Additionally the rock to the left where you encountered it will have a hidden Link Stone
(Lv. ?)
Encountered @ level 28 with moves:
Venoshock
Mud Bomb
Sucker Punch
Drain Punch
from what i understand, Drain Punch is an egg move and the Venoshock is either learnt from TM or bred (considering it's Corey's and it learns it naturally at 36)
(Lv. 23)
Came with
Powder Snow
Confusion
Sing
Nasty Plot
Guess it has Nasty Plot as its egg move?
I met it @level 20 instead
The item found near it is a Nevermeltice
Last but not least, after being able to use rock smash, there is an entrance into the Underground Railnet Cave via Opal Ward (under the bridge).
From there you can use rock smash to clear the way into the next area. The only point of interest is the dull key near the left corner, just before the right corridor. Thus the dull key event can be access in part 13.