SV is easily the most fun I've had with 1v1, PL has only amplified it more and I think this generation is typically always a fun time. It reminds me of SS in the sense where you can use many Pokemon, a lot of low ranked Pokemon being incredibly viable and even underrated but is balanced by prevalent threats that put the tier in check. I previously thought Regidrago was overpowered, but now I think it's fine and is simply a top tier Pokemon and I pretty much came to this discovery when people stopped losing to it (When I stopped getting 3-0ed by Scarf Regidrago too). Pokemon Home has only made the tier better as well, I feel as if every Pokemon added and currently allowed is a great presence to the tier. SV 1v1 is easily the best one in my opinion, being able to use a ton of Pokemon while still being balanced out by centralising forces and I'd like to list some of these more less seen Pokemon that I particularly enjoy.
Florges was typically unseen Pokemon before PL which many people glossed over Pokemon as just a bad fairy, outclassed by others which reign the higher tiers like Sylveon. However, its stats are really great and it has a vast movepool which allows it to be a viable stall Pokemon. Contrary to Klefki, another Fairy-type popularised in PL, this Pokemon isn't just a gimmick that can be seen through and can be a great asset to a team.
Dondozo is a great Pokemon with a powerful STAB Wave Crash and powerful coverage in Avalanche, Earthquake, Heavy Slam, Body Press and Outrage. Typically, it uses its powerful array of moves in combination with Assault Vest which is a way to cover for its lacklustre Special Defense stat; it can also utilise Choice Band, Clear Amulet and Leftovers though these don't see so much usage.
Moltres-Galar I don't know if people weren't using this because it lost Custap Berry but its Assault Vest set remains very effective and with a moveset of Hurricane + Air Slash it can even beat the powerful Iron Valiant who could be assumed to win.
Clodsire can effectively stall out Special Attackers and can counter Water-types and Bellibolt with Water Absorb. However, the move Counter can be utilised to beat a lot of Physical Attackers which lack setup. Though if your team prefers it, you can run Unaware to ignore these stats in the first place. Reliable recovery and the rare access to Toxic are also useful.
Zarude is just as effective as it was in SS, maybe even more. I didn't enjoy running this thing, thinking it was weak last generation but it remains effective even in the higher power of SV. Typically utilising Weakness Policy with moves such as Bulk Up and Encore it is a powerful stall breaker that can break through prevalent threats like Cresselia, Spectrier and Ursaluna.
Florges was typically unseen Pokemon before PL which many people glossed over Pokemon as just a bad fairy, outclassed by others which reign the higher tiers like Sylveon. However, its stats are really great and it has a vast movepool which allows it to be a viable stall Pokemon. Contrary to Klefki, another Fairy-type popularised in PL, this Pokemon isn't just a gimmick that can be seen through and can be a great asset to a team.
Dondozo is a great Pokemon with a powerful STAB Wave Crash and powerful coverage in Avalanche, Earthquake, Heavy Slam, Body Press and Outrage. Typically, it uses its powerful array of moves in combination with Assault Vest which is a way to cover for its lacklustre Special Defense stat; it can also utilise Choice Band, Clear Amulet and Leftovers though these don't see so much usage.
Moltres-Galar I don't know if people weren't using this because it lost Custap Berry but its Assault Vest set remains very effective and with a moveset of Hurricane + Air Slash it can even beat the powerful Iron Valiant who could be assumed to win.
Clodsire can effectively stall out Special Attackers and can counter Water-types and Bellibolt with Water Absorb. However, the move Counter can be utilised to beat a lot of Physical Attackers which lack setup. Though if your team prefers it, you can run Unaware to ignore these stats in the first place. Reliable recovery and the rare access to Toxic are also useful.
Zarude is just as effective as it was in SS, maybe even more. I didn't enjoy running this thing, thinking it was weak last generation but it remains effective even in the higher power of SV. Typically utilising Weakness Policy with moves such as Bulk Up and Encore it is a powerful stall breaker that can break through prevalent threats like Cresselia, Spectrier and Ursaluna.