CFC4 freeze
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The CFC4 freeze occurs in Pokémon Red and Blue. It does not occur in Pokémon Yellow. If the value of memory address CFC4 is an odd value, it can cause the game to freeze after the conclusion of a battle.
Specifically, the value CFC4 stores a check to see if a font is loaded, and is thus known as wFontLoaded. If the first bit is set, thus being an odd value, then when the game needs to load a new tileset into VRAM, the game copies tileset data during VBlank. If the value is an even value, then data is copied while the LCD is disabled. Because this value is set to 1 during battle, the game goes through a code path that results in waiting for VBlank interrupt that will never arrive, due to the LCD being turned off during the battle transition to overworld.
The freeze can be avoided by performing a glitch that would normally cause it to occur in Diglett's Cave.
The following glitches are known for corrupting CFC4.
- "Bad CoolTrainers" (see - (move)). Internal coordinates (can be viewed on BGB) for the tile that determines CFC4 in English versions is at Y=5 X=1.
- Wild appeared! (with 220+ or 0 Pokémon)
- Other buffer overflow techniques such as Super Glitch
- During instant encounter infinite chain glitch
Source
ZZAZZGlitch's video on Overanalysing Glitch Items(paraphrased)
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