Yes, other games in the series besides Pokémon Go do actually exist, and today Nintendo and developer Game Freak released a brand new trailer for Pokémon Sun/Moon for the Nintendo 3DS.
The video shows six brand new Pokémons: Wimpod, Bounsweet, Comfey, Mudsdale, Mimikyu and Bewear, and it's made clear that the game will let us host our own competitions with "Pokémon Global Link".
Additionally, Pokémon Sun/Moon will feature "Hyper Training", which will let us train Pokémon beyond level 100. In other words, we have plenty to look forward to while we wait for the release date of November 23.