and are remakes of "pokémon gold" and "silver", developed by game freak for the nintendo ds. they were released on september 12, 2009 in japan, and were released on march 14, 2010 in north america, march 25, 2010 in australia and march 26, 2010 in europe. there are many new features. like "pokémon yellow", the player's pokémon can follow them. the games come with a pedometer-like device, called the pokéwalker, that can let players walk with their pokémon, and gain watts, which can be used to battle pokémon, or dowse for items.