Where to get large pink eggs?

[Lorrum]

I'm trying to do the Benoit feminisation subplot and have everything but a large pink egg. I can't seem to find any ways to get my hands on one; even the chicken at the high mountains doesn't seem to give a large one, just a regular pink egg. Does anyone know how to get this?

 

[Etis]

She exchange large eggs for 3 doses of elixir, not 2.

 

[Harel]

Alternately, if you have a vagoo, drink 1 ovi elixer, visit the lake a few times (or at uhh 10am?) to choose the color, then drink more ovi elixers until you get the note that the egg is large now.

 

[NEET-Hime]