very nice team you've got- although your offenses are a bit unbalanced, your coverage and 'sheer force' more than make up for it. There are not many single pokemon that can really solidly wall your whole team- though, I must point out Jirachi as a problem, whose typing allows it to take hits from your numerous special attackers all day.
The problem I'm noticing is this- you don't have enough widespread typing coverage- you only have moves from 8 different types- less than half the total amount, meaning your coverage will be lacking. Not only is it lacking- but also very redundant. You have 5 pokemon with Ice type moves- a lot more than necessary. After that, you have fighting and electric coverage- but lo and behold, all 3 fighting type moves are Focus Blast! Both of your offensive electric attacks are both Thunder! What does this mean? Out of rain, and even in it, you will have a hard time overcoming pokemon like Blissey, Jirachi, or Tyranitar. Just face it- you're going to miss, 1, 2, 25 times each match, and that's obviously not good.
I think Landorus is out of place here. Thundurus covers a lot of what it does- it's HP Ice hits harder; its Focus Blast and Thunder as well after Nasty Plot. It's slower than Landorus after Agility, but you have Genesect to handle faster threats. To help you not only hit with a bit more variety but also deal better damage to Calm Minders and special walls, I suggest you switch your current Landorus with Rock Polish Landorus-T.
Landorus-T @ Life Orb
Adamant nature, 4 HP / 252 Atk / 252 Spe
Rock Polish / Earthquake / Stone Edge / U-Turn
Landorus-T fills quite a lot of wholes here- it allows you to have an ok switch in to Breloom, as well as a way to hit Specially Defensive pokemon like Jirachi / Ttar hard. Its Stone Edge also does one very valuable thing- it nails Volcorona, who after just a QD or two walls your whole team. Seriously, nothing bar Politoed can OHKO it- so having some added precaution will always help. After a Rock Polish, this Landorus is almost as fast as your Landorus- and hits a bit harder with Stone Edge and U-Turn as well. It can act as a bulky pivot too- easily coming in on pokemon like CB Scizor and quickly U-Turning out or Rock Polishing for a sweep. EQ simply demolishes Tyranitar and SpDef Jirachi- while dealing a considerable chunk to Blissey as well. Landorus-T also has excellent synergy with the rest of the team- it lures in Gliscor, Skarmory, and Forretress, and U-Turns out to Thundurus for a sweep.
Cool team, I hope I helped!