How To Get A Shiny Pokemon In Emerald In Pokemon Emerald If You Give Your Pokemon A Nugget Will That Help You Get A Shiny Pokemon? Or Up Chances Of?

In pokemon emerald if you give your pokemon a nugget will that help you get a shiny pokemon? or up chances of? - how to get a shiny pokemon in emerald

I've heard that if you keep your Pokemon a nugget that your chances for a bright shiny pokemon Rayquaza will increase. Is that true? Also, avoid any help would catch a shiny Rayquaza / Groudon / cryogenic / three Regi useful. Thank you!