With Lando-T's status as 'blanket check' - here are the mons I'd say befit that status as well:
Celesteela: AKA - Skarm 2.0. It should be self explanitory why this thing is a good blanket check - as Steel/Flying is synonymous as one of the best defensive typing's in OU; It's balanced stat spread, and being basically the only defensive UB in the game. Similar to Lando-T, it can also run the Automatize special set that I have seen from time to time, allowing it to clean up off of the conditioning that you're a defensive build and not an attacking one. I really can't say much new about it that hasn't been said already.
Our guardian deity Tapu Koko is up next. I think we ALL knew this thing would get usage from the day of it's announcement, and BOY HOWDY has it gotten some usage! Thanks to Electric Surge, it's matchup with neutrals such as Scizor, Magearna and the fellow Tapus is among the best in the game due to it's strong Electric STAB. Calcs:
- 252 SpA Life Orb Tapu Koko Thunderbolt vs. 248 HP / 124 SpD Scizor-Mega in Electric Terrain: 204-242 (59.4 - 70.5%) -- guaranteed 2HKO
- 252 SpA Life Orb Tapu Koko Thunderbolt vs. 212 HP / 0 SpD Magearna in Electric Terrain: 208-246 (58.7 - 69.4%) -- guaranteed 2HKO
- 252 SpA Life Orb Tapu Koko Thunderbolt vs. 0 HP / 4 SpD Alakazam in Electric Terrain: 242-286 (96.4 - 113.9%) -- 81.3% chance to OHKO
- 252 SpA Life Orb Tapu Koko Thunderbolt vs. 0 HP / 0 SpD Metagross-Mega in Electric Terrain: 214-253 (71 - 84%) -- guaranteed 2HKO
Etc... thank god for this thing's overall limited offensive movepool, otherwise the meta would be in a LOT of trouble.
Tapu Fini. According to a lot of people, this thing is the defogger the metagame could have done with a good few gens ago, and has respectable bulk to boot. Water/Fairy has also proven itself to be a superb typing in a meta such as this, and has plenty of utility options such as Taunt and Natures Madness to break down bulkier mons. Misty Surge also means that if you're running a primarily grounded team, you don't really need to look for a cleric - and as someone who finds clerics to be underrated, I approve of it. Yes, it's sustain is lacking... but so is Lando-T's, and look where that thing has got us!
Garchomp. Well, hasn't Z-moves done THIS boy a favor? Not only do we have the Scarf sets and TankChomp that we've known for the past couple of gens, but also the 12 dozen ways it utilizes Z-moves. You have sets that work for each STAB, improving it's wallbreaking ability even more - and then you have it's Firium Z set to lure would-be walls like Tangwroth and Celesteela
as well as the bulky Ice that doesn't exist.
I think Ladorus-T has 'set a standard' in what it has been able to do these last couple of generations, and with the ways that Garchomp can juggle Z-moves - I think it's safe to say that Garchomp has set a standard of it's own in that regard - using Z-coverage to invite in things that would otherwise trouble your team defensively. Hell, it's worth noting how it (alongside MagDoom Heatran) has influenced even lower tiers to utilize this mentality and use Z-coverage for themselves, which says a lot in my book (examples being Firium Z Slurpuff (that I came up with and have tested before), Fightium Z Hoopa-C and Bloom Doom Fire types like Volcanion and Emboar, among others).