To your first question: That depends. Which crime syndicate? If it’s Rocket, Plasma, Flare, Aqua, Magma, or Galactic, then simply make sure no police officer’s looking and then do it. If it’s the Goldenrod yakuza, I would highly advise against doing that, as they punch back—by which I mean they will immediately break your knees with steel pipes. And if it’s Team Skull, while I don’t know a lot about that syndicate, I’ve been told that this would be “mean” and that “they’re mostly harmless; how dare you.” (Or at least those were the words Molayne passed to me, courtesy of the Alolan champion, just now.)
To your second: In all seriousness, the only way to stop your furret from imitating you is to not do it in the first place; by doing it, you’re broadcasting to your pokémon that it’s okay to use excessive violence. Although really, if you’re punching a Rocket grunt in the first place, do you really want to stop your furret?
I never thought I’d say “please don’t encourage our readers to commit acts of violence” to anyone but Cassius… —LH