TMHMDex/GS:212
< TMHMDex
Name: TM21 Identifier (HEX): D4 Identifier (DEC): 212 Effect pointer: FA6A
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TM21 is a wrong pocket TM in Pokémon Gold and Silver. Its description is "An attack based on lack of loyalty.".
Effect
TM21 causes arbitrary code execution at FA6A in Echo RAM (a copy of DA6A), which is in the middle of Pokémon 2's data.
This makes it an ideal arbitrary code execution glitch item.