Tweaking
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Tweaking is a glitch that first appeared in the fourth generation of Pokémon. It is caused by pressing the left and right buttons continuously whilst holding the up button. This glitch will throw up invisible walls or cause a section/route to become black, only seeing the shadows of trainers, items etc.
According to some, tweaking may allow players to catch Arceus, Shaymin, and Darkrai, however, this is unconfirmed.