Latios is not only the most threatening wallbreaker in the metagame, but it's the most splashable too. Even with only one Fusion it can easily catch all of its checks off guard with plenty of different options. Choice Specs, Choice Scarf, and Calm Mind are all incredibly effective no matter the team or matchup.
Swampert is the most versatile RegenVest in the metagame with its great movepool, bulk, and typing letting it excel in every single game.
The second best wallbreaker after Latios, Roaring Moon is far more straightforward. Choice Band sets are a nightmare to switch in to because of its ridiculous power and metagame defining speed tier, whereas Choice Scarf sets can outspeed almost any boosted threat while still being very powerful, making it a premier revenge killer.
Great Tusk brings a lot of role compression as a crucial part of the hazard game and an important check to both Roaring Moon and Gouging Fire. Just tons of utility and incredibly splashable.
Gholdengo can pick and choose between top threats for it to manhandle while innately having a lot of very desireable attributes as a Dragon- and Psychic-type resist. Very good bulk means it can live a lot of the most powerful hits in the meta, even without a resistance to them.
The premier catch-all physical wall, Skarmory rises above its competitor in Corviknight because Skarmory is the single best user of Spikes in the metagame, and it has access to the very valuable Whirlwind. Skarmory is just a very effective glue mon for many teams.