On the anniversary of the series. We've been down this road before, haven't we?
http://www.nintendoworldreport.com/news/49855/pokemon-direct-to-air-tomorrow
A major Pokémon announcement will come on Pokémon Day.
Nintendo has announced a Pokémon Direct will air tomorrow at 9 am Eastern time / 6 am Pacific / 1500 CET. The contents of the video have not been disclosed, but the last of these videos in 2017 revealed Pokkén Tournament DX for Switch, Pokémon Ultra Sun/Moon for 3DS, and Pokémon Gold and Silver's 3DS Virtual Console releases.