Aggressive sweeper that doesn't need SplAtk
Well, incidentally this is what the Incarnate Landorus that I caught in Black looked like:
Ability: Sand Force
Nature: Relaxed (-Speed +Defense)
Personality: Quick tempered (+Attack)
I liked everything except the lowered Speed. If you can, get hold of a Landorus with a SplAtk-lowering nature, that'll be more helpful.
You can look natures up here-
Pokemon nature effects
Note that Sand Force ability will strengthen all Landorus' ground, rock and steel type moves by 30% in the presence of a sandstorm. That is why I use Landorus after Tyranitar (Sand Stream Ability) in single battles, and together in doubles.
Earthquake - STAB supereffective against Rock/Steel/Poison/Fire/Electric - benefits from Sand Force
Rock Slide - supereffective against Flying/Bug/Fire/Ice(!!!) - benefits from Sand Force
Fly - STAB supereffective against Fight/Bug/Grass
Outrage - K.O. the OU dragons!!!
This moveset is for instant sweeping, even if Landorus is faced with dragon or ice types. You don't get to sit behind a substitute and use 3 sword dances before attacking. The first sweeper to use a supereffective move wins.
I chose Rock Slide instead of Stone edge since- a) It's more accurate (trustworthy) b) It can make opponents flinch at key moments.
This moveset will work even better for a Therian Landorus (Larger Attack, Smaller SplAtk).
Hope you enjoy this moveset. Cheerio!