These new forms show up when Solgaleo and Lunala use their respective signature moves.
And Grubbin is like a little box of secrets. I think, it will be either bug/electric or bug/ground (the second one may be a stretch). The first typing one is easy to explain as it's clearly said that Grubbin...
The concept behind Yungoos is actualy really cool. It's based on a mongoose(pretty obvious) but the description, that's on the main site, has intrigued me. It says: "Yungoos is not a Pokémon that is native to the Alola region. It was brought to the region to help deal with the explosive...
It's interesting that in the gameplay footage, just before the festival scene, Hala says something about the four islands of Alola. He said that there are four deities that serve as guardians for these islands. And he mentioned one of them - Tapu Koko.
All of this is so exciting! Can't wait for...