Where can you catch shiny Pokemon?

go west of sunyshore city, and go in the patch of tall grass all the way to the far left there you can catch a level 100 golden flaffy, you can capture a red staraptor level 100, but you have to run in the grass with a max repel on. you must run 500 times in this pactch of grass. i caught 3 shiny Pokemon doing this.