Honestly I'm not even sure that a gun could kill a *person* in the Pokemon universe. That world runs on anime physics where humans can survive explosions, electrocution and being blasted over the horizon without serious injury. I mean this a world where small children are trusted to roam the world alone where they will regularly be attacked by wild pokemon, obviously those people are just made of tougher stuff. A glock would hurt but probably couldn't actually kill anyone.
And that's not even including all the human martial artists who can probably match low level fighting pokemon in physical prowess and all the human psychics with telekinetic power. You pull a gun on a human trainer in the pokemon universe and they might just disarm you faster than you can blink or pull the weapon out of your hand with their minds. There's a reason that even the criminals in those games use pokemon as weapons instead of firearms.
And that's not even including all the human martial artists who can probably match low level fighting pokemon in physical prowess and all the human psychics with telekinetic power. You pull a gun on a human trainer in the pokemon universe and they might just disarm you faster than you can blink or pull the weapon out of your hand with their minds. There's a reason that even the criminals in those games use pokemon as weapons instead of firearms.