The initial release of Pokemon Go was just three countries, and with the passage of time developer Niantic Inc. have released the game in 33 countries. Pokemon Go is slowly but surely finding its way into other countries, but the Pokemon Go Japan release has not been announced along with many other countries.
However, the game was released in Japan along side with New Zealand and Australia, but the access to the Pokemon Go in Japan was cut off because of the server demand. Pokemon Go’s servers could not handle the amount of users Playing Pokemon Go in Japan, that is why the game has not yet released in the Pokemon homeland.
Pokemon Go is encountering server problems irrespective of the region, and Niantic CEO John Hanke has said that Pokemon Go will not release in Japan until the server requirement is fulfilled.
At present, the server capacity in Japan is not powerful enough. We are working hard with our partners in Japan to enable the servers to keep up with demand once the game goes online there. We expect it to be released by the end of July.
However, according to some analysts late July Pokemon Go Japan release seems a bit optimistic, and said that September release is more likely.
Hanke has also announced that Pokemon Go will release in 200 countries soon, and given that the game is encountering server problems it might take a while for Pokemon Go to release in Japan.
Pokemon Go encountering server issues is not at all surprising as the game is the highest grossing iOS App in all 33 countries it has been released so far.
Pokemon Go is an augmented reality game for Android and iOS smartphones developed by Niantic Inc.