A pokemon encountered in the wild with an alternative coloring; they also sparkle as they come out of your pokeball once you catch it - which is highly advised, seeing as there is a 1 in 8,192 chance of encountering one each battle. It's a pretty good idea to use a master ball on one if you see one, as the pokemon can sometimes flee before you get a chance to throw your pokeball or you can accidentally weaken it too much and KO it - which is a little like liquid gold running through your fingers.
Josh encountered a shiny pokemon - a Bellsprout - last week; he was so excited that he jumped up and down and accidentally made his Charizard use Fire Blast. He is now in the midst of a deep depression.
von Shiny Bulbasaur 21. April 2013
1 more definition
An alternatly colored pokemon,(e.g. Shiny Wingull)that shines upon coming out of it's ball.
Shiny Pokemon are twice as powreful as thier normal counterparts.
von Light Joker 30. März 2004