Quick notes based on the newest video (haven't looked at others' reactions yet, and literally first comment on here in YEARS):
The Z-moves transformation actually looks interesting overall, interested in seeing how it's similar/different from Mega Evolution.
Alola forms of Vulpix/Ninetales look great, as well as Sandslash. Sandshrew's is my favorite, though. Seriously, if there was ever a winter form of Sandshrew instead of its "desert" look, that's what it would look like.
Alola form of Exeggutor, though...honestly, that's absolutely terrifying, and not in the good way. Giraffe-like neck + trio of dopy looking heads on palm tree body=terrifying combination. Grass/Dragon typing is cool, though.
Oricorio is very interesting overall, particularly the Sensu (Ghost/Flying) style. Also further suggests that Tapu Koko won't be the only guardian deity Pokémon out there. The Dancer ability is especially interesting, and I can see this being particularly effective in competitive battling depending on the orientation of its stats and the tier placements of Pokémon with those kinds of moves.
I'm not sure what to make of Luma as a Pokémon Minior. Obviously the name is based on "mini meteor", and the meteor part kinda explains the Flying-typing...Okay, not really, in all honesty. Still, Shields Down is certainly an unusual ability. Since the ability shifts it to a more offensive form under 1/2 HP, the obvious first thought in regards to competitive battling is how well it'll work with something like a Salac Berry. Rock/Flying isn't the most sturdy of defensive-types, though, so it'll be interesting how to work around that to use its ability properly.
Gumshoos definitely looks...interesting. Looks a decent bit strong, and if looks do indeed end up translating into stats, this could be quite the Pokémon to keep an eye on. Not sure how I feel about it as a "Totem Pokémon" though...
Hey, Fomantis and Lurantis are actually Grass-types this time instead of Fairy-types that look like Grass-types! Also, Solar Blade reminds me of Mugetsu from Bleach. Other than that, not much else to note.
Mudbray actually looks pretty cute overall. Glad to see Stamina is still on it, sure to make its presence known in LC. Definitely glad that it means Mudsdale isn't a Pokémon without an evolution line, as it means you might be able to get that line a bit early (and I really would love to have Mudsdale on my team).
More "riding Pokémon" coverage. Yay. Paid more attention to the art than the gameplay, and I'm very bothered by how the guy riding the Mudsdale looks. Seriously, that drawing of him looks very unflattering.
As for the Island Challenge...It looks like an interesting change of pace. So the Trial Captains+Totem Pokémon+Big Kahuna overall challenge basically amounts to the Gym Leader challenge. I'm very interested in seeing what the other three Totem Pokémon are, since they don't appear to be tied to the type that the Trial Captains specialize in. Also, I am loving the new battle mechanics where they can call in additional support, especially since it makes the battle a bit more realistic in a way (as much as ANYTHING in the Pokémon universe can be "realistic").