well, there is a chance of any game cheating device to mess up your game. the only one i know of is that it glytches your game, but as long as you dont save your game with the cheat on, you should be fine
--------------------------------------------------------------------------- "When Mr. Silent suddenly goes on a verbal rampage, what was I supposed to do?"
if they're like me, then they aren't afraid of their games messing up until it actually happens. it's happened to me on my Emerald Version, but i was the stupid one who saved the game after the glytch happened. i think if you don't save the game if a glytch or something happens, it won't save, and you should be fine, but i'm not sure
--------------------------------------------------------------------------- "When Mr. Silent suddenly goes on a verbal rampage, what was I supposed to do?"
a glytch is something that is wrong with the game. for me, the glytches are that i can ride my bike inside buildings, surf on land, acts like i dove when i'm on the surface of water after i've run into a wild pokemon or trainer, and one time my head was separate from my body (lol). the only thing is though, now when the dive thing happens, i can't get out of the water unless i have fly, so it's very inconvenient
--------------------------------------------------------------------------- "When Mr. Silent suddenly goes on a verbal rampage, what was I supposed to do?"