Super Glitch (Generation I)
"Super Glitch" is a common nickname for the many volatile glitch moves that exist in HEX slots AC through C3. These moves typically have no "real" name, and typically adopt anything from nothing to a Pokémon name or even a random group of letters when used. They have a few different known effects, the most common and famous the TMTRAINER effect. It is suspected that this happens because the attack scrambles some information in the game's RAM. After the battle in which Super Glitch was used, the game always freezes.
Super Glitch is a highly volatile move, hence its name. Almost anything done with this glitch move causes the game to freeze, including using it, replacing it with something else, even just viewing its name--sometimes the game crashes when a Pokémon is trying to learn this move. It has also been known to erase games when it is saved onto a game. Things known to happen that are game-threatening would be changing your name to blank, or "PokéPC" mixed in with random glitchy symbols. It can also have you to have no Pokémon, and when you check it doesn't go anywhere, causing more weird things to happen.
Super Glitch exists in many forms, not all of them dangerous, but the most common one is Super Glitch BE. Many of the most common traits of the Super Glitch move that were described in the above paragraphs were primarily traits of Super Glitch BE. Other versions have been known to behave like the TM and HM moves, and others have caused extremely weird things to occur, although few (if any) Glitch Pokémon learn these variations of it.
Many people mistake the effects of Super Glitch to be the innate glitch effects of certain Glitch Pokémon, the most common example of this mistake being .4. Because .4 has Super Glitch as a starting move, many people mistakenly beleive that .4 itself is extremely dangerous to your game and your save file, while in reality, .4 itself is a perfectly benign Glitch Pokémon, no more dangerous than MissingNo. or 'M. In fact, a .4 acquired by trading a pPkMnp from Yellow Version will pose no threat whatsoever to your game.
Super Glitch has not been thoroughly studied by glitch researchers, though some effects and details have been recorded. Many things are still unknown about it. Because of the potential for damage to a game and/or save file, few have been brave enough to study it at all on their cartridge Pokémon games. Even on ROM Pokémon games, Super Glitch is still difficult to study because it often freezes the game. Still, new discoveries are being made, and perhaps one day the mystery of this highly dangerous glitch move will finally be understood. Right now, these effects are known: TMTRAINER effect PokéPC effect Screwed-up sounds effect