Meowzie's owner was a rich lady who took care of her Meowth, Meowzie, treating Meowzie to everything and even keeping her Meowth in a Poke Ball with diamonds. When she ran out of money, however, she released her Meowzie in the streets of Hollywood and told her "Good luck, darling!" before getting into her car and taking off, leaving Meowzie behind.
Meowzie was the lady's Meowth until her money had nearly run out. As such, she realized she had to release her Meowth, and did so before leaving Hollywood.