Oh wait, here's an idea: how about a bit of "mature" content in the games? Not too
mature, of course, but stuff like Lavender Town's Marowak
incident and the two main "evil" teams getting into a gunfight or something. If you wanna go further, maybe there's a point in the game involving an arguement between, say, the secondary NPC 9we'll call him/er an ally) and rival, which quickly goes wrong (maybe some harsh words used by the rival [again, easy on this part; nobody wants to hear anybody in-game yell out "FUCK YOU!"]) and turns into a full-scale brawl, and the player has to step in & resolve the mess.
I know, I know, Pokémon is mainly for kids. I mean, personally I wouldn't want to see a situation where the player gets shot up in a drive-by shooting, or any senual stuff being used, or blood+guts from wounded 'Mons, or even cursing. Even so, a little bit of violence wouldn't kill the game, would it?