252 SpA Icicle Plate Landorus-Therian Hidden Power Ice vs. 0 HP / 0 SpD Landorus-Therian: 328-388 (102.8 - 121.6%) -- guaranteed OHKO
252 SpA Icicle Plate Landorus-Therian Hidden Power Ice vs. 0 HP / 4 SpD Zygarde: 284-336 (79.5 - 94.1%) -- guaranteed 2HKO
252 SpA Icicle Plate Landorus-Therian Hidden Power Ice vs. 0 HP / 4 SpD Salamence: 324-384 (97.8 - 116%) -- 87.5% chance to OHKO
252 SpA Icicle Plate Landorus-Therian Hidden Power Ice vs. 4 HP / 0 SpD Garchomp: 312-368 (87.1 - 102.7%) -- 18.8% chance to OHKO
252 SpA Icicle Plate Landorus-Therian Hidden Power Ice vs. 0 HP / 0 SpD Dugtrio: 182-216 (90.5 - 107.4%) -- 43.8% chance to OHKO
These are just a few calcs. Lando Explosion also has a very high chance to OHKO many OU threats which I don't feel like looking up. One I know off the top of my head is offensive latios, which would otherwise be guarenteed 3HKO'd by hp ice.