Shiny Stones were introduced in Pokémon Diamond and Pearl's sequels, Pokémon Platinum, and later generations.
In Pearl, you can find other Evolution Stones like:
* Fire Stone: Found on Route 209
* Water Stone: Found on Route 210
* Leaf Stone: Found on Route 206
* Thunder Stone: Found in the Great Marsh
* Moon Stone: Found in the Great Marsh
If you're looking to evolve Pokémon that require a Shiny Stone, you'll need to trade with someone who has a Pokémon Platinum copy or play the game yourself.