Pokémon Ruby and Sapphire/Shining Pokémon

Shining Pokémon are Pokémon with unusual coloring. In the video games, there are only one color of each shining Pokémon. Shining Pokémon are an extremely rare occurrence, as there is only a 1 in 8192 chance of encountering one in the wild. Pokémon anywhere can be shiny. It could be your starter or it may belong to a trainer. Another tell-tale sign of being shiny is when you enter battle with one; a few stars will swirl around the Pokémon, making a twinkling sound. Also, if you look at their stats, the Pokémon's sprite's background is white, not the usual grey, and its Pokédex no. is golden. Rumors that shining Pokémon are stronger then normal Pokémon, or that shinings have a higher chance of having a shining offspring, are not true.

History
Shining Pokémon appeared for the first time in the second generation of Pokémon games (Pokémon Gold, Pokémon Silver, and Pokémon Crystal). They may or may not have been true that their stats were better in the second generation, but they were much easier to find. If you found none in the wild, you would at least find a shining gyarados. The only way you can find a wild shining is to have only one Pokéball of any kind in your bag, then it's all left to chance. And if you find one the chances of finding another double. But besides gyarados the easiest one to find is shining magikarp. It's found right next to Lake of Rage (it may be just a coincidence). The shack next to the lake has a man who wants a huge magikarp (just a shining one really), he says he'll give you a prize (just a max elixer). Other than that shining Pokémon have a relatively short history.

Coloring
Shinings color is pretty basic, the colors are the exact opposite color of the normal one. For example a shining gyarados is red while a regular one is blue.

Shinings in the Third Generation
Shinings haven't changed too much since the second generation except they are a lot harder to find and the old rules don't apply. The only thing that helps is that sometimes using a repel will attract them. One advantage might be, and I stress the word might, is that shinings may receive a better placing in Pokémon Contests. Other than that nothing is gained but satisfaction when you catch one.

Shining Pokémon

 * Dark Green
 * Black