NU player here to discuss a couple predictions.
Lurantis: This is 100% coming to PU no questions asked. Lurantis unfortunately doesnt have the bulk to check anything that a Grass-type slot normally checks (You lose to SD Samurott, SD Kabutops, DD Rhydon, Ludicolo, Specs Poliwrath, Smash Omastar, etc) It's extremely slow to the point that even fat walls / tanks like Vileplume, Lanturn, Hariyama, and Piloswine outspeed you and just pummel you before you can do anything. To make matters worse, Lurantis will also have to face competition from other Hazard Removalists such as Hitmonchan, Shiftry, Tsareena, Golbat, and Hitmontop, all of which can provide more to teams in utility. Offensively, theres 0 reason to use this over our actual good Grass-types like Lilligant (quiver dance + good speed), Shiftry (sd + priority), Torterra, Ludicolo, Sawsbuck, heck even Servine has more use. Fwiw, Defensive Lurantis looks like a solid pick in PU for decent role compression.
Silvally: Silvally looks alright on paper until you see its shallow movepool, lack of recovery, inability to hold a boosting item (bar the Normal form), and competition from other NU sweepers respectively. (Water - Samurott, Grass- Leafeon, Dark- Shiftry, Psychic- Mesprit / Xatu, Normal- Tauros / Kanga / Zangoose /, etc. No form stands out in the tier and for the most part they're either too weak, walled by too much, or just outclassed. That being said, 1 or 2 (most likely Normal which can use Z-Explosion) might have a niche which lets them see some use in NU, for the most part though a significant majority if not all, should drop to PU.
Bibarel: Just use Linoone. Bibarel has been tested a lot in our speculation tours and its honestly still quite weak at +4, still very frail so its difficult to set up, and at the end of the day just a discount linoone. If Linoone ends up getting banned from PU down the road, Bibarel could have a chance to shine, but that scenario is still a long way away.
Lycanroc-Midnite: Like
MaroGod, this is just a worse version of DD Rhydon and SD Kabutops that gets stopped by literally every rock resist in the tier + most priority users like chan and gurdurr. Should be really good here though where Rock-type resists are a little harder to come around, def a mon to look out for.
Alolan Dugtrio: Outside of Sand this mon is mediocre in NU, and with Gigalith settling down in UU Sand is looking to be very rare again. Def see this being quite good in PU as a partner of Stoutland in sand or even just as a solid CB / LO attacker (something like EQ / Iron Head / Toxic / Stone Edge).
Primeape / Passimian: NU is expected to get a lot of Fairy-types this generation (Aromatisse / Togetic / Shiinotic / Comfey) and because of this Primeape's access to Gunk Shot is an extremely useful niche over Passimian who only has the weaker Iron Head to hit them. Primeape is also relatively faster (95 Speed to 80) which means its Choice Scarf set can actually revenge kill a wider range of Pokemon which Passimian misses out on (+1 Lilligant, +1 Vivillon, +2 Omastar, +2 Adamant Barbaracle as well as speed tieing +1 Jynx). However, on the other hand Passimian has nice natural bulk to soft check things like Skuntank and take priority moves better, as well as being relatively stronger (120 Attack to 105). Unfortunately, Passimian lacks Stone Edge so it's forced to run the weak Rock Slide. Overall, while they both have positives and negatives, Primeape is just the better overall pick imo, and Passimian in turn should
probably drop to PU.
Toucannon: A fearsome wallbreaker. This thing is crazy offensively, with Brave Bird / Bullet Seed / Overheat / Boomburst nothing can freely switch into this. Unfort it'll face competition from Dodrio (which we're gonna take), Archeops, and Chatot in NU, not to mention its also quite slow and not too bulky. I can see this making its home in PU and being very tough for Stall / Balance to deal with.
Some NU mons that I predict might drop: Pinsir, Sandslash, Cradily, Kecleon.
