PokÃ mon Black and White take place in the Unova region , which is based on New York City and its surrounding area , unlike past games being based on regions of Japan . The plot of the game follows a new PokÃ mon trainer who is on a journey to become a PokÃ mon master . The protagonist of PokÃ mon Black and White is a teenager who sets out on a journey through Unova to become the PokÃ mon master .