Ok. This is just a glitch that I found in Purity Forest on the 13th floor. I was fighting a Togepi, and either MissingNo, 'M, or a Bad EGG turned the corner in it's ? form. The sreen got all fuzzy and scrambled with those weird glitchy noises (that in my opinion is REALLY annoying) and...yeah...I turned it off...I'm NOT saying that it will happen to you, just a warning to be carefull! (and get through the floors as quickly as possibe)