Played a bit more BDSP OU after the Drizzle ban (thank you!) and I'm actually quite a fan of this meta now! I don't think it's necessarily perfect, but I haven't really found anything apart from maybe Latios particularly overbearing. I'm seeing a very surprising lack of mons like Salamence and Blaziken that should be amazing in theory (and probably are excellent in practice) and honestly can't say how good or bad they are as a result. Regardless, here are a few mons I've really seen putting in a lot of work lately:
Latios is, without a doubt, one of the best mons in OU at the moment. Its Speed tier is incredibly useful, its Draco Meteors and Psychics hurt like nothing else, and it has some pretty decent coverage options to boot. That said, nothing about Latios screams "this needs to get quickbanned immediately" at the moment; its 3-attacks set is amazing and Scarf is fantastic as well, but Latios feels a lot more linear because it can't run Trick or some of its coverage moves it loves in other metagames like Aura Sphere and Mystical Fire/HP Fire, so while it's incredibly strong and incredibly threatening its movepool issues hold it back just a tad in my eyes.
To nobody's surprise, Garchomp is an incredible mon. It's a good breaker and a good Scarfer, and it leverages a fantastic movepool alongside its good base stats to be incredibly threatening. I originally expected Chomp to be outright broken in this meta, but I'm pleasantly surprised to find that it really isn't broken whatsoever. It's incredibly deadly after a turn of setup, sure, but more offensive teams have plenty of tools to deal with it while Unaware Clefable anchors any defensive team nicely so Chomp doesn't just win for free. Outrage isn't at all a spammable move in this metagame, and as such Chomp has to rely on the much weaker Dragon Claw instead. Its Earthquake is amazing, of course, but it's always forced to choose between Yache Berry, Haban Berry, and Life Orb so if it wants to be able to handle threats that might revenge kill it or eat a hit and nail it with an Ice Beam it has to sacrifice a ton of damage to do so, and if it wants to maximize its breaking potential it gets picked off by priority (which this tier has a metric fuckton of) more easily instead. I think Garchomp has a very positive influence over this metagame currently.
I fucking wish we had this mon in SwSh, but I digress. Stallbreaker extraordinaire, with some legitimate offensive presence thanks to its great bulk/typing/Speed combination, and a mon that I firmly believe holds virtually any team archetype together. Almost any team is made immediately better by slapping Gliscor on it, which may be a problem later on, but at the moment I don't particularly mind it because it gets caught in the Dragon vs. Ice crossfire a fair bit. It can also check Chomp in an emergency, which just adds to the long list of things this mon contributes to a team. Easily a top 3-5 mon IMO, but I'm not entirely sure if it's the best mon in the tier.
I've been used to metagames that lacked Rapid Spin for a while now, so seeing Starmie come back with a vengeance and fulfill the same old role that made it iconic for generations is a bit cathartic. It's fantastic offensively, has a fantastic Speed tier, and has access to that now-buffed Rapid Spin for some additional pressure against weakened offensive teams since a +1 Starmie is basically impossible to outpace and OHKO. It can be bulky with Natural Cure if one wants it to last a while, or it can hit hard with a Life Orb and even Analytic to make sure nothing bar Blissey has any business eating a hit from it. It's a great mon that fills a role that I really missed from some of the other OU metagames we've had in the past.
Loom hasn't been talked about here enough, IMO, and I'm really struggling to see why. Both Poison Heal and Technician are fantastic abilities and Breloom once again abuses Spore to make the most out of its specialized movepool alongside those abilities. SubSeed+Focus Punch sets with Poison Heal have deceptive amounts of survivability while hitting like a fucking nuke, and it can always run more offensively-oriented Spore+Focus Punch sets as well as Spore+SD Technician sets as well. I would easily argue that Breloom is a top 5 mon in this metagame, and it's just so splashable to the point where, like Gliscor, it can fit on a laundry list of teams and put in plenty of work each game.
Latios is, without a doubt, one of the best mons in OU at the moment. Its Speed tier is incredibly useful, its Draco Meteors and Psychics hurt like nothing else, and it has some pretty decent coverage options to boot. That said, nothing about Latios screams "this needs to get quickbanned immediately" at the moment; its 3-attacks set is amazing and Scarf is fantastic as well, but Latios feels a lot more linear because it can't run Trick or some of its coverage moves it loves in other metagames like Aura Sphere and Mystical Fire/HP Fire, so while it's incredibly strong and incredibly threatening its movepool issues hold it back just a tad in my eyes.
To nobody's surprise, Garchomp is an incredible mon. It's a good breaker and a good Scarfer, and it leverages a fantastic movepool alongside its good base stats to be incredibly threatening. I originally expected Chomp to be outright broken in this meta, but I'm pleasantly surprised to find that it really isn't broken whatsoever. It's incredibly deadly after a turn of setup, sure, but more offensive teams have plenty of tools to deal with it while Unaware Clefable anchors any defensive team nicely so Chomp doesn't just win for free. Outrage isn't at all a spammable move in this metagame, and as such Chomp has to rely on the much weaker Dragon Claw instead. Its Earthquake is amazing, of course, but it's always forced to choose between Yache Berry, Haban Berry, and Life Orb so if it wants to be able to handle threats that might revenge kill it or eat a hit and nail it with an Ice Beam it has to sacrifice a ton of damage to do so, and if it wants to maximize its breaking potential it gets picked off by priority (which this tier has a metric fuckton of) more easily instead. I think Garchomp has a very positive influence over this metagame currently.
I fucking wish we had this mon in SwSh, but I digress. Stallbreaker extraordinaire, with some legitimate offensive presence thanks to its great bulk/typing/Speed combination, and a mon that I firmly believe holds virtually any team archetype together. Almost any team is made immediately better by slapping Gliscor on it, which may be a problem later on, but at the moment I don't particularly mind it because it gets caught in the Dragon vs. Ice crossfire a fair bit. It can also check Chomp in an emergency, which just adds to the long list of things this mon contributes to a team. Easily a top 3-5 mon IMO, but I'm not entirely sure if it's the best mon in the tier.
I've been used to metagames that lacked Rapid Spin for a while now, so seeing Starmie come back with a vengeance and fulfill the same old role that made it iconic for generations is a bit cathartic. It's fantastic offensively, has a fantastic Speed tier, and has access to that now-buffed Rapid Spin for some additional pressure against weakened offensive teams since a +1 Starmie is basically impossible to outpace and OHKO. It can be bulky with Natural Cure if one wants it to last a while, or it can hit hard with a Life Orb and even Analytic to make sure nothing bar Blissey has any business eating a hit from it. It's a great mon that fills a role that I really missed from some of the other OU metagames we've had in the past.
Loom hasn't been talked about here enough, IMO, and I'm really struggling to see why. Both Poison Heal and Technician are fantastic abilities and Breloom once again abuses Spore to make the most out of its specialized movepool alongside those abilities. SubSeed+Focus Punch sets with Poison Heal have deceptive amounts of survivability while hitting like a fucking nuke, and it can always run more offensively-oriented Spore+Focus Punch sets as well as Spore+SD Technician sets as well. I would easily argue that Breloom is a top 5 mon in this metagame, and it's just so splashable to the point where, like Gliscor, it can fit on a laundry list of teams and put in plenty of work each game.