>>55737683Just give us Mega baby Kanga as an independent pre-evolution, to evolve to Kangaskhan her requires reproducing at level 18 or 21 (Depends on your country) so that explain where the new baby appears from and every time you take Kangaskhan to the pokemon breeder you receive a baby Kanga and a NPC explain that the older baby has become independent and the mother is taking care of the new baby as happens with real Kangaroos.
If this is too complicated just change Kangaskhan to the No-eggs group and explain that they only reproduce in the wild.