Nintendo posted an operating loss of 5.1 billion yen ($49 million) for the April-June quarter, versus a profit of 1.15 billion yen in the same period a year earlier.
Nintendo maintained its outlook for operating profit to climb 37 percent to 45 billion yen in the year ending March. Last week the company said that Pokemon GO would have a limited impact on earnings and that it did not plan to revise its targets for now. Its main source of Pokemon GO income is expected to come from its 32 percent stake in affiliate Pokemon Company which owns the licensing rights.
But the Japanese company also has an undisclosed stake in Niantic - the game's developer which was spun off from Google, and it will sell Pokemon GO Plus - an accessory that alerts players to nearby Pokemon so that they don't have to always be looking at their smartphones.
Nintendo said on Wednesday that the device will be launched in September due to software adjustments.