The Pokemon Team and Nintendo held a Direct specifically for Pokemon today. They announced:
Pokken Tournament DX:
An updated version of Pokken for the Nintendo Switch. It will come with 5 new characters. 4 Pokemon that were only released in Japan’s Arcade: Darkrai, Empoleon, Scizor, and Croagunk and the new addition is Decidueye from Pokemon Sun and Moon. They will also include new support Pokemon as well. The game will also include a 3v3 mode, Daily Challenges, and everything will be unlocked. If you are attending E3, you can play the demo available there. Pokken Tournament DX will release September 22, 2017.
Pokemon Ultra Sun and Moon: Not much was revealed but it is an alternative story from the original Pokemon Sun and Moon. There will be new Pokemon, moves, and a new form for Solgaleo and Lunala. The forms are shown on the image below and you can see influences from Necrozoma, the Legendary Ultra Beast Pokemon. The game will be released November 17th, 2017 worldwide.
Pokemon Gold and Silver will be released on Nintendo 3DS Virtual Console on September 22nd. The Pokemon can also be transferred into the Pokemon Bank which will allow you to transfer them into the current generation games.
For the Entire stream and my source, you can check out the Nintendo Direct below.