Glitch 0xC109 IDs can be found in Pokémon Red, Blue, and Yellow.
This address controls a state of the player's sprite.
In Pokémon Yellow, by adjusting the value of C109 and using glitch item Lg- (0x6E), it is possible to cause different effects, including arbitrary code execution.
The C109 script also executes when walking around one tile above an exit with the value kept while walking.
In order to obtain an invalid C109 address, the player may encounter Yellow regular MissingNo. to obtain a value which varies heavily based on factors such as previous actions in the session and the contents of SRAM (which can be influenced by viewing glitch Pokémon sprites).
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