If that's your concern, you'll need to train them just as hard as any trainer would. It would be better to find a place to stay in town, where it's far less likely that you'll be asked to battle. The majority of the people here will not attack you without requesting a battle. There are... some trainers who will attack as soon as you walk into their line of sight, but they're the people who have always lived in this world, they're odd, but not a threat.

[Archer pauses; time to discuss Team Rocket.]

The only people you need to look out for are members of Team Rocket. They're an organization who steal Pokémon from trainers. They will attack without warning, and have attacked people in the past.