Hello GSC OU Gamers, this was my first year proper of getting into this tier and learning it to a decent level and I feel like dropping off a few sets that I've been running both in ladder and tournaments to pretty good success. They range from somewhat safe to smoking hot (depending on various factors, such as what kind of matchup you are expecting to land yourself into, etc.):
---

Alakazam @ Leftovers
Ability: No Ability
- Psychic
- Encore
- Fire Punch
- Recover
Zam has honestly earned a tonne of respect from me in the teambuilder. It's a lategame menace and forces a lot of ugly 50-50 situations for the opponent to confront, and this is especially powerful if you can reach these lategame stages unrevealed and come in on something like an anticipated Snorlax curse to encore. Your typical offence team is not capable of switching into such a fast psychic attack in the late game, and Snorlax can quite often be relegated to a momentum drain where it is either stuck rest looping or taking spikes damage, trying to shake off repeated encores.
Despite its subpar bulk it can emergency stall certain Pokemon such as Jynx and Vaporeon; Jynx in particular can be forced an ultimatum where it has to fish freeze Alakazam rather than Snorlax in the later stages of the game. There are some other Pokemon that you can super-duper-panic-button-'oh gosh I'm out of options' emergency stall; and non-crunch Tyranitar is fascinatingly one of these Pokemon. Admittedly, you must encore it into rock slide and risk your ~40% odds that you will not be crit before it runs out of PP. Start slamming him with fire punches every time you don't need to recover and fish for burns -- this seals the stall and allows you to win the matchup.
Oh, and never let Zam get paralysed.
---

Forretress @ Miracle Berry
Ability: No Ability
IVs: 26 Atk / 26 Def
- Spikes
- Toxic
- Hidden Power [Bug]
- Explosion
I don't know how well-explored this set is but I don't think I've ever ran into it a single time, it's an anti-lead set where you pretty much always spike turn 1 and pray to your theistic deity of choice that the Snorlax/Exeggutor/Nidoking on the other side doesn't have a fire move. You otherwise have a great matchup into opposing Jynx/Eggy/Nido leads and have an emergency stop-gap towards the former to pave the way for some very aggressive teammates, something which Cloyster less great at providing. Don't even bother trying to catch an explosion onto Jynx if you are lucky enough to dodge a lovely kiss - just poison it or attack it so that it can't cause problems later on.
Speaking of which, don't expect to boom too often on this set, it's more of a luxury than a necessity (unless you're facing some fatty fat stall, then go wild!) but that's a good thing due to Forre's unique defensive offerings.
You probably don't need to worry about keeping the spike up, so try to build in such a way that you can take advantage of the passivity behind an incoming rapid spin.
---

Blastoise @ Leftovers
Ability: No Ability
- Rapid Spin
- Surf
- Reflect
- Rest
If you've encountered me in tournaments or know any of my ladder alts then you've probably ran into me using this. Earlier this year I was constantly meeting Tyranitar teams, so I improvised and came up with this Blastoise set. Quite simply, the idea is that Blastoise compresses the roles of Suicune and Starmie into a single Pokemon. When compared to Starmie, you land into a significantly better matchup vs Tyranitar for a somewhat worse one into Machamp. Essentially you can use it as an aggressive space-paver for Gengar to attempt to beat down and freeze stuff with Ice Punch.
Blastoise conveniently sits at a just great enough speed tier to hand the surf beatdown to opposing Cloyster. Reflect is mainly there to dissuade Snorlax counterplay, but it otherwise helps Blastoise get into a cute acting career where it does its best Suicune impression, so essentially supporting itself with taking attacks from Marowak & Machamp a little easier. Obviously you have the secondary upside of being able to continue checking these two with a teammate if an untimely crit ends Blastoise.
---

Meganium @ Leftovers
Ability: No Ability
- Razor Leaf
- Light Screen
- Synthesis
- Leech Seed
Less-tested than anything else I'm showcasing, but I know this set is used and has some seen some success. Would still like to mention it regardless, Meganium is a pretty interesting scout / status sponge as it's incredibly hard for most teams to 2HKO, and can pretty consistently force screens up as a method of resetting the opponent's momentum. Thus I think it best fits on stall teams that want to drumlax in the endgame, but I haven't experimented much outside of this concept.
Venusaur @ Leftovers
Ability: No Ability
- Light Screen
- Leech Seed
- Razor Leaf
- Synthesis
Same idea with different typing - a better Machamp / toxic check but worse Marowak / Eggy check. Venusaur urgently wants to be paired with Skarmory, and Meganium with Starmie. Pick your poison.
---

热蜗牛 (Magcargo) @ Leftovers
Ability: No Ability
- Acid Armor
- Toxic
- Flamethrower
- Rest
Okay yeah fine, I am just completely fooling around with this one, but Magcargo does some absolutely hilarious stuff if you land the right matchup. Viable? Absolutely not. Usable? Definitely -- it's able to check mono + fire lax sets while keeping Skarmory and Forretress completely out of the field. Bonus points for being a somewhat decent Heracross check also.
Having to speed-tie Steelix is pretty awful though, and it's utter deadweight vs offence teams in general. But for stall vs stall matchups it ain't awful. Much more of a 'for fun' set.
I'd like to conclude by saying this tier still has plenty of room for innovation, despite how restrictive the teambuilder sometimes might seem. For each of these ideas that kinda works, I promise there are at least 3 or 4 that were completely terrible and discarded immediately. If someone as mediocre as me can get to 1500 on ladder using Pokemon as weird as these (not counting Magcargo, he's honestly just trash...) then there is definitely much more room for people to explore new ideas in this tier.
Thanks for reading and happy new year!
---

Alakazam @ Leftovers
Ability: No Ability
- Psychic
- Encore
- Fire Punch
- Recover
Zam has honestly earned a tonne of respect from me in the teambuilder. It's a lategame menace and forces a lot of ugly 50-50 situations for the opponent to confront, and this is especially powerful if you can reach these lategame stages unrevealed and come in on something like an anticipated Snorlax curse to encore. Your typical offence team is not capable of switching into such a fast psychic attack in the late game, and Snorlax can quite often be relegated to a momentum drain where it is either stuck rest looping or taking spikes damage, trying to shake off repeated encores.
Despite its subpar bulk it can emergency stall certain Pokemon such as Jynx and Vaporeon; Jynx in particular can be forced an ultimatum where it has to fish freeze Alakazam rather than Snorlax in the later stages of the game. There are some other Pokemon that you can super-duper-panic-button-'oh gosh I'm out of options' emergency stall; and non-crunch Tyranitar is fascinatingly one of these Pokemon. Admittedly, you must encore it into rock slide and risk your ~40% odds that you will not be crit before it runs out of PP. Start slamming him with fire punches every time you don't need to recover and fish for burns -- this seals the stall and allows you to win the matchup.
Oh, and never let Zam get paralysed.
---

Forretress @ Miracle Berry
Ability: No Ability
IVs: 26 Atk / 26 Def
- Spikes
- Toxic
- Hidden Power [Bug]
- Explosion
I don't know how well-explored this set is but I don't think I've ever ran into it a single time, it's an anti-lead set where you pretty much always spike turn 1 and pray to your theistic deity of choice that the Snorlax/Exeggutor/Nidoking on the other side doesn't have a fire move. You otherwise have a great matchup into opposing Jynx/Eggy/Nido leads and have an emergency stop-gap towards the former to pave the way for some very aggressive teammates, something which Cloyster less great at providing. Don't even bother trying to catch an explosion onto Jynx if you are lucky enough to dodge a lovely kiss - just poison it or attack it so that it can't cause problems later on.
Speaking of which, don't expect to boom too often on this set, it's more of a luxury than a necessity (unless you're facing some fatty fat stall, then go wild!) but that's a good thing due to Forre's unique defensive offerings.
You probably don't need to worry about keeping the spike up, so try to build in such a way that you can take advantage of the passivity behind an incoming rapid spin.
---

Blastoise @ Leftovers
Ability: No Ability
- Rapid Spin
- Surf
- Reflect
- Rest
If you've encountered me in tournaments or know any of my ladder alts then you've probably ran into me using this. Earlier this year I was constantly meeting Tyranitar teams, so I improvised and came up with this Blastoise set. Quite simply, the idea is that Blastoise compresses the roles of Suicune and Starmie into a single Pokemon. When compared to Starmie, you land into a significantly better matchup vs Tyranitar for a somewhat worse one into Machamp. Essentially you can use it as an aggressive space-paver for Gengar to attempt to beat down and freeze stuff with Ice Punch.
Blastoise conveniently sits at a just great enough speed tier to hand the surf beatdown to opposing Cloyster. Reflect is mainly there to dissuade Snorlax counterplay, but it otherwise helps Blastoise get into a cute acting career where it does its best Suicune impression, so essentially supporting itself with taking attacks from Marowak & Machamp a little easier. Obviously you have the secondary upside of being able to continue checking these two with a teammate if an untimely crit ends Blastoise.
---


Meganium @ Leftovers
Ability: No Ability
- Razor Leaf
- Light Screen
- Synthesis
- Leech Seed
Less-tested than anything else I'm showcasing, but I know this set is used and has some seen some success. Would still like to mention it regardless, Meganium is a pretty interesting scout / status sponge as it's incredibly hard for most teams to 2HKO, and can pretty consistently force screens up as a method of resetting the opponent's momentum. Thus I think it best fits on stall teams that want to drumlax in the endgame, but I haven't experimented much outside of this concept.
Venusaur @ Leftovers
Ability: No Ability
- Light Screen
- Leech Seed
- Razor Leaf
- Synthesis
Same idea with different typing - a better Machamp / toxic check but worse Marowak / Eggy check. Venusaur urgently wants to be paired with Skarmory, and Meganium with Starmie. Pick your poison.
---

热蜗牛 (Magcargo) @ Leftovers
Ability: No Ability
- Acid Armor
- Toxic
- Flamethrower
- Rest
Okay yeah fine, I am just completely fooling around with this one, but Magcargo does some absolutely hilarious stuff if you land the right matchup. Viable? Absolutely not. Usable? Definitely -- it's able to check mono + fire lax sets while keeping Skarmory and Forretress completely out of the field. Bonus points for being a somewhat decent Heracross check also.
Having to speed-tie Steelix is pretty awful though, and it's utter deadweight vs offence teams in general. But for stall vs stall matchups it ain't awful. Much more of a 'for fun' set.
-----
I'd like to conclude by saying this tier still has plenty of room for innovation, despite how restrictive the teambuilder sometimes might seem. For each of these ideas that kinda works, I promise there are at least 3 or 4 that were completely terrible and discarded immediately. If someone as mediocre as me can get to 1500 on ladder using Pokemon as weird as these (not counting Magcargo, he's honestly just trash...) then there is definitely much more room for people to explore new ideas in this tier.
Thanks for reading and happy new year!