So Fennekin's evo looks like its final stage will be Fire/Fighting, but it learns some Psychic moves so I guess it'll be like a Zorua v2. I predict it being Fire/Psychic btw. Thought it was going to be a specially offensive oriented poké, but seems I'm wrong.
Chespin looks odd now, I think no one expected that evolution (I expected something similar to Cyndaquil's evolution line). I also would say Grass/Rock or Grass/Ground. Looks like it'll be defensive.
Froakie looks great and by its body shape I'd say it'll be a fast physically offensive mon. Water/Fighting for sure.
MegaMewtwo X was obvious (the pokémon web was showing Mewtwo with two circles below it if I remember correctly). Psychic/Fighting will be badass. If Chansey could take a Psystrike, take now a Hi Jump Kick, haha.
The Meowstick poké... stats flip and different movepools depending on the gender looks original and cool.
Fossil pokés are the coolest of them all in this gen imo. T-Rex's ability powers up bitting moves, umm, well I'd have preferred Rock Head (when this rly) and Diplodocus' is just cool, dunno how it'll work, if it just changes normal type physical moves to Ice and gets the stab boost, anyways, Ice Body Slam sounds cool.
MegaGarchomp has same ability so I expect more attack or speed or defenses, w/e.
Toriniam looks like one of those curly hair dogs, has a nice defensive ability. Seems it changes colors depending on something.