I've been replaying Pokemon White version. So my next couple of gear grinding things are going to be Generation 5 related.
One that comes to mind off the bat, and while it's not a huge one, it's one that annoys me. The critical red zone music. When your Pokemon are in the red zone of their HP, the music suddenly changes to this dramatic music as if to tell you that your Pokemon is almost out of HP. Like that ringing RPG alarm noise isn't enough. Clearly the game thinks I don't know my Pokemon is on it's last legs. Gen 5 had some really nice battle music to really pump you up to fight. Team Plasma grunts, Final N, the Elite Four, Champion Alder. While I was never in the red zone for Team Plasma grunts, the E4 and Alder do get me to that point and it sucks that such killer music is cut off for that lame dramatic music. I know my Pokemon are in a critical state, game! The RPG warning bell noise was enough. Thankfully XY got rid of that. But that dramatic music did grind my gears when leveling up my Pokemon.
And then there's the Gym Leader music. It's nice and all but then you get to the final Pokemon on their team and this generic heroic theme starts playing. I don't mind this one as bad as the critical red zone music. It's just much more generic then the actual Gym Battle music and I know this is the last Pokemon on their team because the Poke Balls that indicate how many Pokemon the Gym Leader have left will be down to one. But this one's not even half as bad as the red zone dramatic music. You'll find yourself healing just to get your regular music back.