1. Difficulty Settings (Hard Mode)
2. Following Pokemon
3. At least 100 new pokemon (not including new Alolan Formes)
4. Alolan or Mega Milotic
5. New customization features: Makeup (lipstick, eyeliner, eyeshadow, mascara), Design your own clothes (like Animal Crossing, paint designs on various canvases), nail polish, Facial Hair, Colorful Hair Dye (Green, Red, Pink, Blue, Ect), Eyewear (sunglasses, Monocles, eyepatch, glasses), Masks, Face paint, Scarves, Jewelry (Necklace, Earrings, Choker, Tiara, Crowns), Props (Trident, Fan, Sword, Whip, parasol, Wand, Staff), handwear (elegant gloves, oven-mitts, rings, biker gloves). As well as more distinct clothing that allows for the player to have more personality, typing specialty, or theme motif.
6. Pokemon Accessories (Ribbons, collars, bows, headresses, hankerchief, sunglasses, necklaces, bracers, or other things to denote team colors/theme)
7. The starters' final evolution concept art is confirmed 100% real! I want my Poppmaid!!! I also do not mind having alternative evolutions and formes.
8. An elegant/regal/cute fire type pokemon for me team (Turtonator and Salandit) aren't fitting the bill as do (Arcanine, Volcarona, Camerupt, Blazekin, Houndoom, Pyroar, Rapidash, Ninetales). Though, Salandit female split evolution has me very interested if the rumor is true.
9. Customizable Pokemon, unfortunately Stufful's reveal pretty much means there will not be a build-your-own stuffed animal fakemon, but a customizable pokebot would be fun and could tie in with Magearna's story. I would love to create a pokemon and select a type (alongside steel typing) and see others' creations (of course there would be some sort of limitations on which abilities and movesets could be assigned). You could add a set of ears, eyes, body types, ect along with painting the model. As it evolves you can upgrade it's parts and send QR codes to friends for downloading your pokemon and have them train and evolve them as you have crafted. Also, this would get pretty insane with something equivalent to a wonder trade mechanic. I am pretty sure this will never happen, but I would cry if it were implemented; it would open up so many possibilities.
10. Most importantly, a good post-game. Something like a battle frontier would be a dream come true.