Shiny pokemon are pokemon with a different color than the real pokemon. These pokemon ARE EXTREMELY RARE, but luckily for me I found a shiny Pikachu in the (ruins of) Viridian Forest when I first Got my game on 9/10/04. Whenever you do find a shiny pokemon the pokemon, at the start, will have a pair of stars fly around then disseparate away. Disseparate=2 disapear. Good Luck.