In "Pokémon X" and "Y", Kangaskhan is one of many Pokémon to receive a Mega Evolution, and Mega Kangaskhan's child leaves the pouch to enter battle, allowing Mega Kangaskhan to attack twice in a single turn.
In "Pokémon X" and "Y", Kangaskhan is one of the few Pokémon to receive a Mega Evolution. While the mother remains unchanged, the child becomes slightly older and leaves the pouch to battle alongside its mother, allowing Mega Kangaskhan to attack twice in a single turn.