>>49176759The explanation of how the eggs hatch would imply that they have to make mentions of the existence of reproductive systems in Pokémon, and thus the franchise would become minimally rated as +13, in worst-case scenarios +17.
If they reproduce asexually, it would still require mentions of asexual reproductive systems.
For the same reason, we have never seen blood or gore, explicit violence to humans, sex or features of +13, +17 or AO games.