Overall, your team is looking good for monotype. These are some changes I would make:
Mienshao:
Good start. I'd replace toxic with something else, however. Mienshao is fragile with 65/60/60 defenses, so getting off a toxic without getting OHKO'd is tough. High Jump Kick is a good alternative, to deal heavy damage.
I'd also replace the Muscle Band with a Life Orb. The extra damage comes in handy and Regenerator minimizes the drawbacks. Overall, this is a pretty good set.
Machamp:
This is a decent set. Not much I would change here. However, I think Gems are for attackers that hit once for high power and then die soon or for attackers with Unburden or Acrobatics. Machamp is bulky enough to set up on physical attackers and sweep. I'd replace the Gem with Leftovers for HP support when setting up for a sweep. Overall, I like this set.
Infernape:
I like this set. Fast and strong not much more to it.
Hawlucha:
This set is pretty good as well. I wouldn't change much.
Gallade:
Pretty good, although, as stated in the comments, BrightPowder is banned in competitive play, I think. Leftovers or Life Orb are pretty good for this set. This set also has very little to hit Dark-type pokemon. Add a Fighting more like Close Combat, which works well with Bulk Up and Gallade's nice Special Defense.
Heracross:
I don't think you need this guy on your team. He doesn't provide you with stuff you don't have already. Plus, a bulky Heracross still gets messed up by Brave Bird and Flying Gem Acrobatics. I'd say to replace him or make him speedier and change his moveset. Maybe change it to something like: Megahorn, Close Combat, Stone Edge, Earthquake.
Overall, your team is pretty good. However, your team has two main problems:
1) Weakness to fast Flying-types like Talonflame
2) Weakness to physically defensive Pokemon.
Both of these can be solved with Lucario. A simple Extremespeed, Aura Sphere, Flash Cannon, Dark Pulse set can help deal with these problems a little bit. I'd maybe replace Heracross with Lucarionite Lucario with this set. If you want to keep Heracross, I'd say Scarf him and get rid of Gallade.
Hope this helped! Good luck with your team!
