This is obviously all opinion, just felt like whipping one up. Note that this isn't going to be a list of every team that can get to 2k points in PvP, since I think many teams can do that, but just a short list of the main teams you'll be running in to on the ladder.

1st: Cool Headed

The Cool Head characteristic team is definitely dominating the game right now. You can ask anybody who's in the top tiers, Cool Head cores are basically everything you will see. They're the tankiest team in the game, they resist rollback, they have a way to get around Ult Seal... there's really nothing they can't do. The release of Sasuke hurt, but at the same time he also has the Cool Head characteristic so he's both made the team stronger and also enabled a counter to it. It's my opinion that Cool Head Core Misa Sasuke is currently the strongest team in the game for general use. Since its core is only 3 units, they also have free space to tech in basically any units to counter specific matchups (Such as Kinniku to negate HRT teams, etc.) making it extremely versatile. The biggest weakness of the current Cool Head build is that it requires two PvP units, Neuro and Kurama, to work. The good thing is that Kurama is very easy to acquire and the medal to JA him into Yoko Kurama will soon be available for everyone.

Recommended units:

• Light Yagami
• Neuro Nogami
• Yoko Kurama
• Sasuke Uchiha
• Misa Amane
• Killua Zoldyck
• Ai Amano
• Kinnikuman
• Naruto Uzumaki
• Dracule Mihawk
• Aya Toujou

2nd: Heart

Heart teams have been dominant for a long time, and that doesn't look like its going to slow down anytime soon. Their core players are just too good. Vivi's buff skyrocketed her up the tier list and made her one of the best support characters in the game. They have great utility and great damage. The addition of Sasuke also gives them more ammo against their Cool Headed rivals and a chance at continuing to compete for the top spot. They also are frequent users of All Might's Guts ability which, when combined with Vivi, gives their normally fragile units more staying power.

Recommended Units:

• Son Gohan
• Dai
• Nefertari Vivi
• Ai Amano
• Son Goku
• All Might
• Sasuke Uchicha
• Dracule Mihawk
• Misa Amane
• Momo

3rd: Athletes

Athletes are a team that's been historically dominant on offense and terrible on defense fell out of favor a bit when Son Gohan dropped. The addition of Sasuke and Mihawk heavily cutting the damage from Cool Head teams and speeding up their cooldown by 5% makes them a much more devastating team than they have been lately and rockets them back up. They have unparalleled team synergy, tons of buffs, fast ults, and enemy rollback. One downside to the athlete team is their strict team build and their requirement of a PvP exclusive unit that is rather old to function.

Recommended Units:

• Tsubasa Oozora
• Rukawa Kaede
• Tezuka Kunimitsu
• Dracule Mihawk
• Sasuke Uchiha
• Fuji Shusuke
• Ryo Ishizaki

4th: Anti-Meta STR

This is a fairly-specific team designed to counter Cool Head, and its extremely good at it. Using Ichigo's high powered ult and multiple cooldown increasing units alongside Bobobo's disruption helps rip apart Cool Head shields and finish them off before their nukes go off. It doesn't do as well against other builds but you can easily get to 2k farming Cool Heads alone, so it takes this spot simply for its ability to prey upon the best team in the game.

Recommended Units:

• Ichigo Kurosaki
• Yusuke Urameshi
• Misa Amane
• Ai Amano
• Bobobo Bobobobo

5th: Blueberry Rush

5th place is the fast, high-damage blue teams that shred enemies with auto attacks and fast ultimates. It's sort of an evolution of the old Gangstar team, but removes Giorno and Bruno in favor of Xanxus who is a bit better suited for the modern meta. You can still run Bruno and Giorno if you so choose, but they are a bit weaker nowadays compared to how they used to be. This team would be higher if not for the fact that it might be the worst defense-team in the game, as it is completely free to Cool Head teams when AI controlled making you an easy target and causing your points to plummet. On offense though, its one of the best.

Recommended Units:

• Xanxus
• Kobayakawa Sena
• Killua Zoldyc
• Maam
• Ai Amano
• Giorno Giovanna
• Bruno Bucciarti
• Light Yagami
• Naruto Uzumaki
• Dai
• Sasuke Uchiha

So that's just a quick top 5 of what I think the strongest PvP teams are. If there's a team you'd like an overview for, a team you think deserves a better ranking/to be on the list, or you just think I'm completely wrong and stupid feel free to let me know in the comments.