Niantic has enlisted the help of the venerable Stephen Fry to narrate its "nature" documentary for Pokemon Go. It includes a look at all of the new Pokemon that have entered the game from the Hoenn region and some from Pokemon Ruby & Sapphire. You'll see such exotics as water Wailord and Plusle and Minun.
If you're still playing Pokemon Go, you'll definitely want to check in starting tomorrow and keep checking back through November 1st. For the first time, third-gen Pokemon will be included. As you collect, you'll find a lot more ghost-type and spooky Pokemon including Gengar, Cubone and Misdreavus.