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Reason: Exact cause, and why the fix works
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Inverted sprites (also known as Scrambled sprites or Reversed sprites) is a side-effect of encountering certain Glitch Pokémon or viewing their stat screen in the Generation I games.
As the name implies, this glitch causes the sprites to appear backwards or flipped. In normal gameplay, only front sprites are mirrored across the x-axis when viewing Pokémon in the stats screen, the effect displays sprites incorrectly when it is applied to the back sprites. In addition, while the front sprites of the opposing Pokémon flip properly originally, once the sprite is updated (through attacking), it breaks. The broken inversions do not cause permanent damage.
To fix the effect, the Pokédex entry or stats screen of a non-glitch Pokémon needs to be viewed.
Official Nintendo statement
Nintendo has an official description of MissingNo. listed in their Customer Service troubleshooting section, which includes a nonworking method of fixing the effect:
"MissingNO is a programming quirk, and not a real part of the game. When you get this, your game can perform strangely, and the graphics will often become scrambled. The MissingNO Pokémon is most often found after you perform the Fight Safari Zone Pokémon trick.
To fix the scrambled graphics, try releasing the MissingNo Pokémon. If the problem persists, the only solution is to re-start your game. This means erasing your current game and starting a brand new one." 
Nintendo was incorrect on the method for fixing this behavior; releasing MissingNo. does not fix inverted sprites. Instead, looking at the stats of a non-glitch Pokémon should fix the problem.
|This glitch is in need of research. |
Reason: No reason specified.
You can discuss this on the talk page.
In Red, Blue, and Yellow, an address in the RAM determines whether the sprite of the Pokémon in battle is inverted or not. The address in Red/Blue is 0xd0aa, and 0xd0a9 in Yellow. The normal value is 0x00, which results in the sprite presented in its normal orientation. When any value other than 0x00 is entered, it results in the sprite being inverted.
Viewing the Pokédex entry of glitch pokémon with the Pokédex number 00 or a number above 151 results in the value being changed, therefore inverting the sprite. Viewing the Pokédex entry or stats screen of a non-glitch Pokémon resets the value to 0x00 and makes sprites be presented in the normal orientation.
|This glitch Pokémon article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.|