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The Speed EVs + Scarf allow Landorus-T to outspeed Timid 252 Tapu Koko.
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Offensive:
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 116+ Def Tapu Fini: 279-328 (157.6 - 185.3%) -- guaranteed OHKO
252+ Atk Landorus-Therian Earthquake vs. 0 HP / 0 Def Tapu Koko: 446-528 (158.7 - 187.9%) -- guaranteed OHKO
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 4 Def Aegislash-Shield: 272-324 (83.9 - 100%) -- 6.3% chance to OHKO after Leftovers recovery
252+ Atk Landorus-Therian Rock Slide vs. 0 HP / 4 Def Charizard-Mega-Y: 476-564 (160.2 - 189.8%) -- guaranteed OHKO
252+ Atk Landorus-Therian Earthquake vs. 184 HP / 0 Def Metagross-Mega: 272-324 (78.3 - 93.3%) -- guaranteed 2HKO
252+ Atk Landorus-Therian Earthquake vs. 80 HP / 0 Def Tyranitar: 360-426 (99.7 - 118%) -- 93.8% chance to OHKO
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 184 Def Amoonguss: 207-244 (47.9 - 56.4%) -- 31.3% chance to 2HKO after Black Sludge recovery
252+ Atk Landorus-Therian Knock Off (97.5 BP) vs. 248 HP / 0 Def Cresselia: 216-256 (48.7 - 57.7%) -- 95.3% chance to 2HKO
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Heatran: 744-876 (192.7 - 226.9%) -- guaranteed OHKO
252+ Atk Landorus-Therian Rock Slide vs. 0 HP / 0- Def Salamence-Mega: 174-206 (52.5 - 62.2%) -- guaranteed 2HKO
252+ Atk Landorus-Therian Earthquake vs. 0 HP / 0 Def Tapu Lele: 246-291 (87.5 - 103.5%) -- 25% chance to OHKO
252+ Atk Landorus-Therian Rock Slide vs. 248 HP / 240+ Def Zapdos: 158-188 (41.2 - 49%) -- guaranteed 3HKO after Leftovers recovery
252+ Atk Landorus-Therian Earthquake vs. 4 HP / 0 Def Kartana: 154-183 (59.2 - 70.3%) -- guaranteed 2HKO
252+ Atk Landorus-Therian Earthquake vs. 4 HP / 0 Def Kangaskhan-Mega: 195-229 (55.3 - 65%) -- guaranteed 2HKO
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 4 Def Ferrothorn: 153-181 (43.4 - 51.4%) -- guaranteed 3HKO after Leftovers recovery
252+ Atk Landorus-Therian Earthquake vs. 68 HP / 244 Def Snorlax: 396-466 (162.2 - 190.9%) -- guaranteed OHKO