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Pokémon Rumble Showdown, includes all Pokémon from Gen 7 along with "old favorites" from previous generations. Digital only, slated for August.
Lastly, Pokémon Guardians (working title), a tower defense game being developed in-house at Nintendo. We don't know much about it, other than it's the only one of these to feature a significant number of Gen 8 Pokémon. Currently slated for 2019, unlikely to get a physical release.
That's all I know. 2019 has a lot of spinoffs planned, and while I'm skeptical of a few of these, I'm pretty optimistic about what they're doing with the franchise. Not to mention PMD5 IS ACTUALLY HAPPENING I CAN'T BELIEVE IT
