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TM17 is a . .s.a Enemy (PKMN)W n L:C O (RIVAL)C (0x3C)-type glitch move in Pokémon Yellow.
On the Fight menu, the type of this glitch move obscures the glitch move's actual name. When it is successfully used, it will deal damage with no animation and seemingly no other effect.
Glitch Pokémon which learn TM17 (0xD9)