Chinese as well.They get all monk techs much cheaper.
IMO if you have to fight against monks,you have to use a unit that is disposable like skirms.So I don't understand using plummies against Aztec monk rush.
Skirms does only work if you have a lot more than the enemy has monks. Plumed does work if you can mass them (and it depends on the micro of your opponent), because they kill monks quickly.