quote from a user named blazikien from this question: http://pokemondb.net/pokebase/26247/what-is-the-best-way-get-shiny-pokemon-in-pokemon-black-white
"I have a theory that the rustling grass has a better chance of shiny. I've captured two shiny audino this way
(no cheats) I can't prove it though."
Nope, it is just chance. All encounters, regardless of what they are (unless it is 100% shiny or Masuda Method), have a 1/8192 chance to be shiny.
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