I've had two copies of Pokemon Emerald in my life (the first one gone now...), and while playing my second copy, I notice that sometimes, there is an error in the looping music on Route 113 (the route with the ashy grass).I'm not sure how to explain it, or if I'm even naming the instrument correctly, but that really loud trumpet noise it makes in the music, it occasionally makes it once more than it should. For example...
*music* DUN-DUN... *music continues*
But in my cartridge: *music* DUN-DUN...DUN-DUN... *music continues*
I've never once had this happen in my original copy of Emerald, and I'm not really sure what it means. I'm absolutely sure my cartridge is real, however, the previous owner did cheat on the cartridge. If I need to upload a video to explain better, I can do that.
As far as I remember, it's never happened on my copy of Ruby either.