Okay, so I was riding on the bike and randomly out of nowhere it automaticly started moving to the right on it's own. Then whenever I woud enter the menu or the shortcuts menu it would move down on it's own. I saved and soft reset and the bug still persisted even in the main menu. Once I got back into the game I had to go into the bag to dismount the bike and once I went into a route building the bug went away.
You all seem to lack reading comprehension, which is ironic as Pokemon needs basic reading comprehension to fully enjoy the game, and you all seem to have less than basic reading comprehension.
Let's have a look at this. He was riding his bike, and it suddenly started to act up. He went into the menu and it constantly scrolled down. He saved, reloaded and the experience persisted. He got into a route building and it stopped. He mentions no prior issues in the history of his new 3DS XL. The 3DS and the XL is a tightly made console; nothing big enough would be able to get inside and lodge itself temporarily in the directional inputs of the controls. Stranger still that it stopped once he entered a building. Maybe it's a sentient piece of dust?
I understand that you enjoy Pokemon, but to believe that it is a perfectly made game is just naivete at its best. I'd say this is a minor bug, but you guys are obviously going to flame me now. Let's just say his 3DS XL was possessed by a Marowak.