Details: Should you go to your house and speak with your mother's Meowth after defeating the Pokemon League, a neighbor from Hau'oli City known as Madame Meowth will stop by with her Meowth. She will brag about her Alolan Meowth over your mother's Kantonian Meowth, causing a battle to begin between the two Pokemon. If you select Return to attack the Alolan Meowth, you will win the battle. Your mother will then reveal that she was a Scratch Cat Girl back in Kanto, shocking Madame Meowth and having her vow to return one day. Meowth will then give you a PP Up.