I've never seen an Avengers-based Pokémon team. Here's my review...
Machamp: The moveset you have come up with is one of the best I've seen. It has a perfect nature and perfect EVs. Its Ability is good for screwing opponents that are using Fly or something like that. If I were you, I'd put in coverage for Psychic types.
Thundurus: It's good. I think you should use the remaining EVs for defenses, so you could be a bit more bulky and set up better with Nasty Plot. The strategy you're using for it is great. The hold item is great as well.
Floatzel: Again, like the others, it's good, but I'd recommend a Jolly nature. Aqua Jet is great for finishing off weakened opponents and Pursuit has 80 base power when it's used on a target switching out. It's an annoyer in my opinion. I think a Mystic Water would be good to power up its two STAB attacks. Aqua Jet's base power will be 72 and Waterfall's base power will be 144!
Zoroark: It has the best strategy in the team! The only thing I'm worried about is Focus Blast. It has low accuracy compared to the other moves. But you can keep it if you want.
Scizor: I have to say that Bug Bite is not my kind of move, but it's good for stealing any Berries. Bullet Punch is perfect. Acrobatics with the Flying Gem is good too. Swords Dance is the best way to set up these moves. It's second with the good strategy after Zoroark.
Gallade: I think the best hold item would be Leftovers, just for restoring extra HP after using Drain Punch. Shadow Sneak is yet another great priority move. You can cut ahead of something fast like Gengar (It would also be super-effective!). It's third with the good strategy after Scizor.
My verdict on this team: Not good... Not great... Not awesome... ...It is one of the best teams ever!
Gets an up vote from me. I wish I could up vote it even more!