Glitch move 0xFD on a Magikarp's move list.
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999ZAA (hex: FD, variable name) is a randomly named glitch move in Pokémon Gold and Silver.
It has a variable name in the summary often with 9 in it, and it may be shown to be of the Fighting-type with 6 base Attack. Attempting to open the Fight menu with this move in it may reset the game in a Glitch Dimension.