Didn't forget about your PM
Ajwf is correct in pointing out that you're Talonflame weak, the lack of a Flying resist is probably this team's biggest flaw, and by extension Mega Pinsir is a little a bit annoying as well, though at least you have enough offensive pressure + Talonflame to make something work. Landorus-T might be an option to consider over Mamo if you want Stealth Rock, though Thundurus is also a good option to consider over Mamo too if you want to forego the rocks entirely. You can run the Nasty Plot + Taunt set which absolutely punishes slower, defensive teams. I noticed that you were looking at a physical Thundurus set which is cool, though Defiant>>>>Prankster in those cases because you get attack boosts from stat drops, which is great if you have a SR user to lure Defog but sadly that isn't the case for you. It destroys Conkeldurr and Venusaur with Fly too, and OHKOes offensive Latias with Knock Off with Rocks up =(
I prefer Outrage over Dragon Claw on my Lum DDnites because Lum can act either as the status protection when the opponent tries to WoW you, or it can act as a protection against confusion if you don't use up your Lum Berry when setting up. I also prefer Earthquake to Fire Punch, because while you lose out against things like Scizor, Earthquake helps you against Aegislash (since Kings shield works against Fire Punch) as well as Heatran, Heatran in particular is pretty annoying to this team because it can stop sweeps easily against Scizor/Dragonite/Talonflame/Latias and force you to bring out your Mamoswine and Greninja--and being as offensive as you are, is not an easy feat.
Thundurus@Leftovers
Timid 252 spa / 252 spe / 4 hp
Thunderbolt/HP Ice/Taunt/Nasty Plot
You can also consider HP Flying on Thundurus which is nice for Venusaur and Conkeldurr, though Ice has uses with OHKOing Gliscor, Chomp and Landorus right off the bat.
Sorry for taking so long, it's been a long week for me x_x