Earlier this year around the time E3 2018 was about to kick off, Nintendo made some announcements of their own where they confirmed that they would be launching a new core Pokemon game for the Nintendo Switch. The game was initially pegged for the second half of 2019, but now it looks like it could be delayed ever so slightly.
By saying the second half of 2019, basically we're looking at anywhere between July to December, and we're sure that many are hoping it will be July. However now that it has been pushed to late 2019, it means that we're looking at anywhere between October to December. This "delay" was confirmed by Nintendo themselves in their launch schedule which now pegs the game's release for late 2019.