Grass/Ghost came out of nowhere. It's definitely better than Grass/Flying for sure, but Inceneroar has a double leg up since both it's typings are super effective against it. Decidueye is a pretty dumb name though, I don't even know how to pronounce it.
The Tapus look really great in motion. I didn't expected one to be a Grass type. Having a grass field move could be really interesting. It's my favorite type, but it definitely has more cons than pros at times.
AND BATTLE TREE. QUEEN CYNTHIA. THE LEGENDS RED AND BLUE. Wally.
Also the Japanese trailer shows more of the Battle Tree. When fighting Cynthia, it says that the next person will be 31st with the options of continue, suspend, record, or scout. After he selects "scout" it cuts to a scene of a double battle with Cynthia. On the website it says you can this is so they can fight with you in future battles, but I'm not sure what exactly that entails.