i don't mean for it to just be hatches or ages.
if you've got the first achro, by whatever means, then you've got the first one. something being the same but having a number (that can be changed) say that it's older doesn't make it the first.
it would be recorded just how things are recorded... i don't know how that stuff works.
i understand the confusion there.
and the credit of it
could simply be, when you open its pet profile, there's a small pixel image of a certificate, that once you click it, it could come up with a box (like it does when you click a human avatar/pet) saying something about
*this pet* was the 1st/2nd/3rd pet to ever be *whatever it's 1/2/3 at*
it became this, on *date* with *user* as his/her owner
it would need cleaning up.. like i said, i'm not good at explaining xD