Pokémon sprite corruptions (Generation I)
Pokémon sprite corruptions in Pokémon Red, Blue, and Yellow are typically caused whenever either the front or back sprite of a glitch Pokémon is viewed. There are many different types of corruption.
Walking characters glitch
The walking characters effect is a glitch in Pokémon Red, Green, Blue, and Yellow, which is caused by some glitch Pokémon.
While this effect is active, NPCs will appear and walk in a pattern on the screen.
Applicable glitch Pokémon
- MissingNo. (English Yellow non-Fossil/non-Ghost variants)
- ヅ (0xBF) (Red/Green)
- アネﾞデパミﾞ (0xFF) (Japanese Yellow)
Inverted sprites glitch
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Many glitch Pokémon including regular MissingNo. and 'M (00) cause the inverse sprites glitch after encountering them or viewing their Pokémon summary.
This glitch causes Pokémon front and back sprites to appear fixed. The problem can be fixed by viewing the summary screen of any non-glitch Pokémon (or some glitch Pokémon).
The inverse sprites glitch is useful for catching Horsea (English versions) or Pikachu (Japanese versions) for CoolTrainer♀ corruption.
This glitch occurs when memory address 0xD0AA (Red/Blue) or 0xD0A9 (Yellow) is a non-00 value.
Sound and/or sound bank corruption
Some glitch Pokémon sprites lead to the corruption of music, including potentially the sound bank.
The sound bank (located at C0EF, C0F0) controls the 'type' of music to play, and valid values include 02 (locations 1/overworld), 08 (battle), 1F (locations 2/in doors) and 20 (special music).
When the sound bank is an invalid value, it can lead to potentially a freeze and/or tile corruption.
Sound bank corruption is notably caused by both Yellow MissingNo. and ♀ . (0xC1), with glitch music and sometimes a repeating "(POKéMON) is trying to learn" message.
Sometimes the music will be corrupted but the game will not freeze.
Both ?/ (0xEC) and ♂ p ゥ (0xF4) are also capable of corrupting the music via their Pokémon summary.
Other effects
- Corrupted tileset アネﾞデパミﾞ (0xFF) in Japanese Yellow
- Corruption of the next number of Poké Ball rolls
- Misaligned character
- If the player tries to Dig or Escape Rope away after the corruption, then the player's sprite may move up and wrap around the screen possibly indefinitely
- 0xC109 ('facing direction') corruption. Can be used to cause facing direction arbitrary code execution after using Lg- (hex:6E)
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