On second thought, I think I'll pass with Natures/IVs. I can re-breed the Cyndaquil with some of my existing parents for the correct spread; I just need the special ball haha.
So here's what I have that isn't already on your list-
Safari Ball: Lotad
Level Ball: Weedle, Rhyhorn, Shuckle, Elekid
Heavy Ball: Snorlax, Gligar
Lure Ball: Yanma
Love Ball: Slowpoke
Friend Ball: Ralts
(Only gender and ball will be guaranteed. They'll have random 5IVs and possibly the correct nature and some egg moves but I can't promise anything other than what's ensured.)
Since Cyndaquil has a low female ratio you can pick two 50/50 gender Pokemon or one low female rate Pokemon (such as Snorlax or Elekid) in return for it. Hopefully you consider my offer, and thanks in advance :]