Shiny Shadow Pokémon glitch
Fire-type Magneton glitch (Stadium) | Life Orb glitch (Pokémon Battle Revolution) | Dark Void glitch (Pokémon Battle Revolution) | Control stick neutral position glitch (GameCube games) | Infinite balls (Colosseum) | Infinite continues (Stadium 2) | Pokkén Tournament glitches (Pokkén Tournament) | Shiny Shadow Pokémon glitch (Colosseum and XD) | Mystery Gift shop glitch (Pokémon Battle Revolution)
This glitch is for a home console Pokémon game. 
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Within Pokémon Colosseum and Pokémon XD, like all main handheld Pokémon games after Generation I, it is possible for an encountered Pokémon with pseudo-random characteristics to appear as a Shiny Pokémon at a probability of 1 in 8192 encounters. The characteristics of a Shadow Pokémon do not remain constant and are determined by the 'random' 32-bit (or 4 bytes in standard 8-bit convention) personality value, where specifically the 'shininess' is calculated by taking the result of the wikipedia:bitwise xor'd player's I.D and 'secret I.D' number, taking the result of using the bitwise xor function between the first two words (16-bit) bytes of the Pokémon's personality value and checking whether the bitwise xor function of the two results is less than eight; meaning that there is an 8 in 65536 (or 1 in 8192) chance that the encountered Shadow Pokémon will be shiny.
However, in Pokémon Colosseum and Pokémon XD, if a Pokémon is captured by the player for unknown reasons the first 16-bit byte or 'word' of the personality value is recalculated, hence there is a 65528 in 65536 (or 8191 in 8192) chance that the Pokémon is no longer shiny after it appears in the player's party, or the storage box system. Likewise, if a non-shiny Pokémon is captured by the player, there is a 1 in 8192 that it appears as a shiny Pokémon in the player's party or the Pokémon storage box.