Metagame Benjamin Butterfree (Playable on Dragon Heaven)

Hazard stacking is very strong in this meta! Crustle and Forretress are pretty much guaranteed 2-4 layers thanks to Sturdy, probably more if the opposing lead is passive/when Custap gets released. Ferrothorn and Scoliopede are promising, too.

Also, Ultra Beasts may lack pre-evolutions, but Beast Boost is a deadly tool in an OM where knocking out an opponent may provide a second, weaker opponent with identical weaknesses right afterward. Same with Magearna and even Moxie Heracross, both of which can snowball on squishier teams after a Shift Gear boost or using Choice Scarf.
I have a question. Every time your Pokémon de-evolves, does it activate abilities such as Beast Boost and Soul-Heart?
No, they will only activate when it actually faints. (The engine, both on the server and the client, has no way of bringing a Pokémon back from 0 hp, so the format has to prevent this until you run out of devolutions. Only then will Destiny Bond, Beast Boost etc. activate.)
Does Intimidate activate each time a Pokemon devolves? If so, Krookodile and Luxray might be a bit more viable for their 3 stage Intimidates.

An interesting thing to see is if Rain remains the best weather, all the other weathers have 2-stage setters (Hippowdon for Sand, Ninetales for Sun, Aurorus & Ninetales-Alola & Abomasnow for Hail) and has multi-stage speed boosted abusers (Excadrill, Stoutland and Sandslash for Sand, Venusaur, Shiftry, Exeggutor for Sun, Beartic and Sandlash-Alola for Hail) that can help the NFEs to remain as threats, while Rain's setters and best abusers only have access to their weather abilities for 1 stage.

Speaking out Stoutland, CB Stoutland seems pretty strong in general, as even Lillipup could probably contribute a bit offensively after being worn down, and Herdier supplies a second Intimidate (assuming that triggers when devolution happens) or backup Sand sweeper after Stoutland goes down.

Trapping in general seems better than ever. Magnezone with either Specs or Scarf seems like the ultimate way to frustrate Steel-types with 3 stages of Magnet Pull, though Magnemite would probably have a hard time contributing without Scarf, and Dugtrio in theory should have a larger trapping range now that it has the possibility of following up being KO'd with a Diglett (potentially Sash'd if Dug took prior damage, or CB maintaining some power).

Some sets I think might be worthwhile:
Scolipede @ Eviolite / Insect Plate / Toxic Plate / Focus Sash
Ability: Speed Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature / Jolly Nature
- Spikes
- Toxic Spikes
- Protect / Endeavor
- Pin Missile / Poison Jab

If you plan on using Endeavor, use it with Focus Sash. Once devolution happens you get a full heal for sash which can help set up Endeavor and an extra turn of laying spikes. Pin Missile and Poison Jab are its main STAB options, as the whole evolution chain has access to these moves so Scolipede and the NFEs aren't entirely passive.
Crobat @ Eviolite
Ability: Infiltrator
EVs: 248 HP / 8 Def / 252 Spe
Jolly Nature
- Super Fang
- Brave Bird / U-Turn
- Defog
- Roost

Super Fang means even Zubat is capable of causing pain, and you also get a 3-stage defogger to keep hazards under control. Could maybe fit some other utility options like Toxic, Tailwind or Taunt here, and could be EV'd for max Def or SpD instead for increased longevity across all 3 stages.
Ninetales @ Heat Rock
Ability: Drought
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Foul Play
- Will-O-Wisp
- Fire Blast
- Hypnosis / Psyshock / other

Venusaur @ Life Orb
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Giga Drain / Solar Beam
- Sludge Bomb
- Hidden Power [Fire]
- Growth / Sleep Powder

Shiftry @ Life Orb
Ability: Chlorophyll
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature / Hasty Nature
- Knock Off
- Explosion
- Seed Bomb / Solar Beam
- Swords Dance / Defog

Two 3-life Chlorophyll sweepers with plenty of setup and support options available, and naturally Ninetales as a 2-life sun setter that can keep sun going for quite a while. Ninetales is a glorified Drought-bot, if it or Vuplix does anything more than provide Sun then they have exceeded expectations. If Venusaur is using Sleep Powder, Ninetales really should drop Hypnosis for something else.
Gengar @ Choice Scarf
Ability: Cursed Body
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Shadow Ball
- Sludge Wave / Sludge Bomb
- Focus Blast / other move
- Trick

Scarf Gengar looks better than ever with two moderately fast forms with decent SpA across all 3 stages for revenge-killing and cleaning. Focus Blast might not be preferable as only Gengar has access to it. Specs might work for Gengar too, but the NFE stages might struggle with faster teams.

Edit: Also, will there be any considerations of dropping some Uber Legendaries at some point? With only 1 life, the weakest Ubers might not be as strong as they used to against all the multi-stage Pokemon available
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Charizard-Mega-Y @ Charizardite Y
Ability: Solar Power
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Dragon Pulse
- Hidden Power [Ice]

Megazard Y as we all know is a Special powerhouse capable of breaking walls with ease
(I hope it works in this way such that the prevos get Solar Power)
Charmeleon and Charmander can take advantage of Drought with Soalr Power after Zard Y faints and hit real hard for a NFE and LC mon's standard
They get all the moves except for Solar Beam, you can replace it with Air Cutter or Ancient Power so that Charmeleon and Charmander get all the moves but I like Zard Y with Solar Beam

Sharpedo @ Sharpedonite
Ability: Speed Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Protect
- Waterfall
- Crunch
- Ice Fang / Psychic Fangs

Though the Speed boost gets lost and you have to use Protect again but still the evolutionary line can do loads of damage
Waterium / Darkinium Z on Sharpedo is another option to grab a KO
The engine, both on the server and the client, has no way of bringing a Pokémon back from 0 hp, so the format has to prevent this until you run out of devolutions. Only then will Destiny Bond, Beast Boost etc. activate.
A recent client change means that a patched server can show a Pokémon reduce to 0 HP and still devolve it. However, all this means for ROM is that I removed the 1 HP workaround; I haven't actually considered activating Battle Bond/Beast Boost/Destiny Bond/Moxie/Soul Heart on a devolution, although it could be done...
skill linkers seem pretty interesting, being able to ko evolutionary families all in a few moves, however their own preevos are either not that great or they dont have on at all. the best ones imo would be cloyster and mega heracross. hera is more immediately threatening but he doesnt get a pre evolution, while cloyster has a harder time setting up and once it de evolves it loses its boosts. shellder has a better defensive typing than cloyster but loses out on ice stab and cloysters huge defense. the other skill linkers are still not great: ambipom is just really outclassed, toucannon is too slow and its pre evolutions underwhelming.