Over the years people have tried to make fan made mmo's for the pokemon world and each and everyone of them has been taken down by Nintendo.
Eventually it seems they've finally got the picture that being able to play pokemon with everyone is a good idea. Well done... how long has World of Warcraft been out... sorry I digress.
This is a great move for the company. Moving from handheld gaming to mobile is only in there interest.
Get ready for an all-new Pokémon experience! Pokémon GO opens a universe of Pokémon to find, catch, trade, and battle on your iPhone or Android device! With Pokémon GO, you'll discover Pokémon in a whole new world—your own! Pokémon GO will use real location information to allow players to experience catching, trading, and battling Pokémon. Visit our site for more information.