It's pretty minor, but I just noticed this while I was going around to past routes with all the HMs, and picking up the items that need Surf, Waterfall, etc. But after choosing "Yes" to use Waterfall to go up, or in the split second prior to going down a Waterfall after surfing to the edge, a kind of black line a few pixels tall appears along the screen, about 1/8 of an inch from the top of the DS Lite's upper screen. I didn't notice it 'til now, probably because it isn't easy to spot if whatever is on your top screen is dark enough. It's really easy to see while ascending the waterfall that goes to the Victory Road entrance. Just thought I'd see if anyone else had experienced this quirk?