Just wanted to let you know, I sent you a message regarding catching Shiny Pokemon in FireRed. :)
Key is still, you need to be patient since all Pokemon encounters have a 1/8192 chance to be shiny... Everyone's luck is different but I always have crazy luck in my FireRed game to have some shinies, even got a SHiny Bulbasaur once with Soft Resetting and a whole lot in Safari Zone :)
You really need to be patient and dedicated to hunt for the shiny you want, it will be rewarding when you do get one eventually, good luck! :)