Mamoswine @ Life Orb
Trait: Thick Fat
EVs: 108 Atk / 148 SpA / 252 Spd
Naive Nature
- Ice Shard
- Icicle Spear
- Earthquake
- Hidden Power [Fire]
Considering that Lando is attempting to sweep, I believe our first step would be trying to facilitate that sweep, something that at this point is much more important than defensive synergy and the like. The goal should be to give lando the ability to sweep in as timely a manner as possible, and mamoswine helps greatly with this.
Hidden Power Fire mamo not only makes a fantastic lure, able to ko all of it and lando's common switch ins, but it is also a rather potent pokemon in general, as it doesn't lose all that much power from its traditional sets with the EV split. Here are some calcs on pretty much all of what will be dealing with lando:
148 SpA Life Orb Mamoswine Hidden Power Fire vs. 224 HP / 32 SpD Skarmory: 153-182 (46.78 - 55.65%) -- guaranteed 2HKO after Stealth Rock
252 Atk Life Orb Mamoswine Icicle Spear (3 hits) vs. 252 HP / 184+ Def Gliscor: 420-516 (118.64 - 145.76%) -- guaranteed OHKO
-1 252 Atk Life Orb Mamoswine Icicle Spear (3 hits) vs. 200 HP / 244 Def Landorus-T: 390-468 (105.69 - 126.82%) -- guaranteed OHKO
148 SpA Life Orb Mamoswine Hidden Power Fire vs. 252 HP / 168 SpD Ferrothorn: 182-218 (51.7 - 61.93%) -- guaranteed 2HKO after Stealth Rock
148 SpA Life Orb Mamoswine Hidden Power Fire vs. 252 HP / 4 SpD Forretress: 354-421 (100 - 118.92%) -- guaranteed OHKO
252 Atk Life Orb Mamoswine Icicle Spear (3 hits) vs. 252 HP / 252+ Def Hippowdon: 210-258 (50 - 61.42%) -- guaranteed 2HKO after Stealth Rock
(Hippo can't switch in, nor can he slack off stall due to the possibility for more than 3 hits.)
Clearly, Mamo is able to not only eliminate, but also
LURE in these counters (bar the ground/ice ones, though they can't threaten lando while he's in and lando 2hkos them so it isn't an issue) which is what makes mamo so attractive. If we used something like heatran or infernape or latios, yes they could indeed kill all of these pokemon, but they would not be given the chance (you know, switching), whereas with mamo,
those pokemon that it is designed to kill will be switching IN. And then are either weakened to the point that lando can sweep or they switch out and give you free momentum.