As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Kangaskhan:
Did you know? Although it’s carrying its baby in a pouch on its belly, Kangaskhan is swift on its feet. It intimidates its opponents with quick jabs. There are records of a lost human child being raised by a childless Kangaskhan.
Source: The Pokémon Company