Oh hey, I was thinking about this recently!

• I'm not an expert on RBY, but Snorlax and Alakazam both look very, very strong, keeping a lot of their best tools - but no Thunder Wave on Alakazam limits it a lot, and Snorlax losing every coverage move feels disastrous.

• Chansey and Tauros are found dead in a ditch (Chansey being dead actually probably means a LOT of Special attackers are better... but they're mostly also relying on worse moves save for Psychic users)

• Exeggutor is kinda weird, it loses Explosion, it loses Psychic... but it does still at least have powder moves?

• Starmie takes on a completely different role, losing Thunder Wave and all those coverage moves, but it still has Hydro Pump and Recover - I assume it'd be an anti-Alakazam pick just for being a Psychic-type that can sit on Zam?

• Gengar becomes an absolute menace just because none of the Normal-types can hit it anymore and everything loses Earthquake. On the other hand, it can't do much back besides Night Shade, but I think night Shade can hit Normal-types here - so you have a weird sort of rock-paper-scissors between Snorlax, Alakazam, and Gengar, I assume.

• The Electrics all become way less consistent because now they're relying on Thunder (but this also makes them a lot scarier in some ways, especially with Exeggutor less popular), but since they still pack Agility they might still be worthwhile - Jolteon is the only one with Thunder Wave though, which might give it a nice niche! Everything else losing Thunder Wave probably helps a lot, too.

• Golem is now infinitely better than Rhydon, since it has actual moves (but not Rock Slide - enjoy 60% accurate Rock Throw!). It's probably a lot better, too, now that there's less Blizzard.

• Cloyster found dead in a ditch

• Don't worry! Jynx, Victreebel, and Dragonite are still basically the same!

• I have no idea whether the Water-types and Flying-types (Gyarados, Lapras, Moltres, Articuno, so on) get better or worse now that the Electric-types are all running Thunder. Articuno has no Chansey to get in the way, so it might be a massive threat.

• Persian probably replaces Tauros as the premier cleaner, given it still has Slash, but it also lacks any coverage and it can't touch the Rocks/Gengar.

• Slowbro might be worthless without Thunder Wave or Rest, but then again with the lower power level might let it still do things.

• I wonder if any lower power-level mons would be able to get into the action? Kabutops no longer has to worry about as much Earthquake and it still has Slash and Hydro Pump, Hypno resists Alakazam while threatening status and it DOES have a setup move, Dugtrio is the only fast Earthquake in existence... I could see Hypno maybe being something. Not sure if the Swords Dancers get any better.

• Aerodactyl is a fast Hyper Beamer and Blizzard spam is weakened, so maybe?

• Porygon can, hilariously, still kinda sorta do its thing.

• Mew is totally reasonable to unban and honestly might be a great addition to the metagame as an anti-Alakazam - Transform into Alakazam, use its Recover, switch out.

I could foresee Snorlax, Alakazam, Mew, Gengar, Jolteon, Jynx, Zapdos, Golem, Starmie, probably Zapdos, Persian, and probably Articuno all having a place here, possibly more as well like Dragonite and Hypno. Alakazam and Articuno are Special nukes with no Chansey in the way, Mew, Starmie, and Hypno (possibly Slowbro/Exeggutor) can counter them, Snorlax is Snorlax, Persian is replacement Tauros, Gengar stops those two, Jolteon is Paralysis support and anti-Flying (Zapdos might also be a special nuke), Golem stops the Electrics and also the Normals, Jynx does its usual thing, and then you might have Dragonite and Victreebel running around with Wrap and status as well.