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Pokédex sorting 0x59 is a glitch Pokédex sorting in Pokémon Crystal.
Arbitrary code execution at region CD88 in RAM when opened. Can be ended with only a ret with no known issues.
Pressing Select to get to mode selection screen may cause the game to softlock on a black screen with the music continuing to play. Eventually the low HP sound may start playing and arbitrary code execution (81B0 in the VRAM observed) may occur.
When accessed with C7D8 method
Pressing A may cause arbitrary code execution at region 86CD in VRAM. VRAM may be locked, resulting in a Glitch Dimension and the "This Game Pak is designed only for use on the Game Boy Color." message.