You know it, the 4MSS is strong in this one. Do not use HP Flying. It is unable to get past Skarmory to an extend and Rotom-W. In most cases it is better to stick with HP Ice, which also hits Breloom, Lati@s and Gengar, but additionally makes short work of Gliscor and Scarf-Mence after RP. Focus Blast allows you to muscle past Breloom and Rotom-W after SR as well as Balloon-Heatran, but struggles a bit after SR. Unfortunately you fail a 2HKO against Gliscor at +1 when it protects, does pitiful damage against Lati@s and Gengar walls it completely. Psychic is similar, accurate and weaker. You can overcome Gengar and Gliscor easier but need to do more damage against Choice-Rotom-W. The lack of an equivalent special move to Stone Edge hurts his coverage. But should you use this one, take either HP Ice or Gravity, though the latter probably requires a bit more setup than Landorus can archive. In hindsight, just forget what I have written. Ground/Ice has the best SE coverage but has only a mediocre neutral coverage.