has no flying moves :c
Sigh no Landorus, what were you thinking. (Also isn't Tornadus a genie too? Tt's in the same family as Landorus and Thundurus.)
Landorus is a really metagame-defining threat right now; actually, I dare say, it is the most threatening Pokemon in the tier as of now. It boasts a great ability in Sheer Force, and also has a great movepool to capitalize off that, consisiting of gems such as Earth Power, Sludge Wave, Knock Off, Rock Slide, Psychic, Knock Off, Focus Blast etc.. It really doesn't have counters - the only viable ones are Mega Latias and Cresselia (and Magnet Rise Klefki, but that can't switch in), really. In addition, it's moves are easily tailored to fit the team's needs; for example, the most common set ran is Rock Polish | Earth Power | Sludge Wave | Hidden Power Ice, but depending on the team, can be changed to suit its needs - alternate coverage moves such as Rock Slide, Psychic and Knock Off can deal with various Landorus checks to the most common set, such as Tornadus-T, Gengar, and Latios.
Landorus also does well against all playstyles, and because of this there really isn't a playstyle 'safe' from it. Calm Mind sets destroy stall and balance, All-out Attacker sets (sometimes utilizing Stealth Rock and/or Knock Off), easily punch holes in all teams alike early-game as well as crippling Chansey with Knock Off, while Rock Polish, which is arguably its most common and most effective set, cleans up nicely against offense and weakened balance teams.
Landorus pairs great with a lot of Pokemon. Rock Polish sets, which I happen to have the most experience with, pairs great with Pursuit trappers such as Tyranitar and Scizor, as Ground-/Poison-/Ice-type coverage struggles against Ghost- and/or Psychic-types such as Gengar and Latios; Tyranitar also helps weaken Keldeo, because Modest Landorus's Earth Power doesn't OHKO it from full health.