Typo
Pokémon names are proper names. Thus, a Ditto, not a ditto. UltimateSephiroth 11:40, 14 March 2011 (UTC)
The plural of 'ovum' is 'ova'. Pandamonia 14:13, 14 March 2011 (UTC)
I don't see in what sense mammals laying eggs is a theory. Theories are explanatory models. Try "observation" or "phenomenon". PLA 09:13, 15 March 2011 (UTC)
Non-scientific?
It's also important to note that the daycare center owners specifically say that they have no idea how the egg got there, and in Gold/Silver, you are told that no one has ever seen an egg being laid, and that they are apparently rare.
It's possible that there is no intercourse involved to create a new egg. Especially considering that all Pokemon are sapient, and that many are explicitly magical, it's possible that eggs are produced through some ritual, possibly sinister and malevolent in its particulars.KrytenKoro 00:59, 22 March 2011 (UTC)