There should be a special section on the forums or web; since wiki version is not always up-to-date; that contains all pet data in a form of a guide.
I do not think a majority of people are into hatching the pets as... enthusiastic as things were back then and I believe there are things that are being missed out because of this. I am not disregarding the very handful dedicated player base that wants to "collect them all".
I understand that in wiki it lists "detailed" description of where and how such pet was obtained but since the information listed is third party info of said person of owning or obtaining such pet, anyone could argue that the info is questionable unless numerous people can confirm it.
So I guess what I am asking is if you could just make a list of all the pets without giving detail information by showing "Hints" that there is still undiscovered pets in drops or hatching, it would give some nice flavor of what to look forward to. Like in treasure hunting, knowing that it exist out there and its there to be discovered and obtained.