hey there, i was beginning to wonder what character you had on your v3..
i've gotten mametchi from my very first egg on my v3, i took very good care of him and didn't miss any of his attention calls.
even after the training bar is full i think the extra attention calls count.
even so, what generation is he?? if he's 3, 5, 7, etc.. the previous parents might affect his growth anyways, if you believe in that aspect.
on my v3, my toddler just turned into a "bad care" toddler, while his parents were an "average care" parent(Bibio) and a "really bad care" parent(matchmakers choice LOL *defensive*)