Original: Shiny PokÃ mon are not necessarily better than regular PokÃ mon, although in Gold, Silver, and Crystal, they have better-than-average individual values. In the third generation, however, "shininess" is determined by another value, and shiny PokÃ mon are not stronger than any other PokÃ mon in battle.
Simplified: Shiny PokÃ mon are a different color than that PokÃ mon normal for their species.