I read on bulbapedia that shiny Pokemon have a certain IV count. I was wondering that if you had two Pokemon with a similar IV count; would you be able to use the correct power items to get a shiny easier? Or was the specific IVs for shinies only in generation 2?
In Generation III, most of the data structures were redone. As such, a Pokémon's Shininess would no longer need to be linked to its stats due to incompatibilities between the previous generations. The determinant for Shininess is instead a calculation based on the Trainer ID number and secret ID number of the player encountering it and the personality value of the Pokémon. The same method is used in Generations IV and V.
Source
