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- (random internal name) is the English Pokémon Red and Blue version of - (Generation I move) and a CoolTrainer♀ (hex:7A) type glitch move.
Its random internal name can be used in battle for CoolTrainer♀ corruption (if the state of the RAM allows it), such as the TMTRAINER effect turning the foe into MissingNo. (hex:32) if the player opens the item menu without the inverse sprites glitch active, or Horsea if the player opens the item menu with the inverse sprites glitch active. Other corruptions can occur from modifying the saved screen data outside of battle by opening the items, or Pokémon or a similar menu just before entering battle, and not opening the items or Pokémon menu again.
If this glitch move successfully hits, it will have the animation of Fissure and may cause arbitrary code execution at Echo RAM region F928 (equivalent to D928 in WRAM) if it does not knock out the opponent. This region is part of the opposing Trainer's Pokémon team data (specifically at Pokémon 4).
This glitch move's effect was used in a tool assisted speedrun of Pokémon Blue by MrWint to beat the game relatively quickly.
Glitch Pokémon which learn "-"