@Iatos Ok, here are some guidelines for fights between humans. It's fine to get into a fight, just no ridiculously excessive martial arts moves. You can land a punch, but just remember the other guy is also going to be a good fighter, you won't be able to beat him to a pulp. If you want to go the "fighting dirty" route, there's nothing stopping you from having your Eevee use Sand Attack on someone, and then trying to get past.
Also, bear in mind how the Pokemon are likely to react if people attack their trainers.